HP mt40 Reference Guide
Contents
1. HP Velocity Technology Overview Copyright 2013 LiveQoS Incorporated All Rights Reserved Microsoft Windows and Windows Vista are U S registered trademarks of Microsoft Corporation Confidential computer software Valid license from HP required for possession use or copying Consistent with FAR 12 211 and 12 212 Commercial Computer Software Computer Software Documentation and Technical Data for Commercial Items are licensed to the U S Government under vendor s standard commercial license The information contained herein is subject to change without notice The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein Third Edition May 2013 First Edition June 2012 Document Part Number 689165 003 Contents Contents id rs a li AN Aa cas 3 HP Velocity technology overview 4 Quality of Experience with HP Velocity 0 cece eee eee eens 4 Benefits of HP Velocity gees a ciate ein ane A Fete tai ete 5 HP Velocity COMPONEN S ooooccocccc eee eee 6 Livin oras Pha is a Ke dd de Dads aed gare naka aad wad earn aa 7 TCP QoEsandipacket lossiiit sic a a ania ee A A tek oi 7 UDP QoE and packet loss irns snit sssi rani eee eee eens 8 Packet loss protection cui ater sda Adel ete ates a Sane eee b2. 42966 RGS TCP Inspecting Protecting 0 04 2 1 10 0 50 75 1039 10 0 51 3 42966 RGS TCP Inspecting Protecting 0 04 2 1 Local Loss 8 ES 8 Local Rx Throughput Kbps o e E Logging Interval Save Log Snap Fi Save Flow Record aging Interval Pese oe 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 HP Velocity Technology Overview 4 NOTE HP Velocity protects flows between HP thin clients and HP Z Velocity enabled virtual desktops or terminal services servers Benefits of HP Velocity Adaptive network analysis HP Velocity continuously monitors end to end network conditions for individual data flows providing adaptive optimizations and data flow protection Monitoring HP Velocity collects and reports an extensive set of statistics e System Information Operating system network adapter CPU and memory usage e Endpoint network statistics Network loss rates corrected loss rates throughput and latency Per flow network statistics Network loss rates corrected loss rates throughput and latency Packet loss protection HP Velocity protects against packet loss which is key to improving an application s QoE Packet loss reduces application throughput degrades or halts streaming applications and introduces lag for interactive applications Latency mitigation HP Velocity boosts application QoE in a high latency environment By actively adapting TCP HP Velocity automat
3. adation over the network network congestion corrupted packets and hardware issues Packet loss caused by network impediments can result in QoE issues with streaming applications Voice over IP VOIP video conferencing and virtualized environments TCP QoE and packet loss TCP a network transport protocol guarantees the reliable delivery of packets When packet loss occurs TCP stops delivering packets to ensure that packet order is preserved The receiver will request retransmission or the sender will automatically resend any unacknowledged segments At this point TCP slows down and connection throughput is decreased As an example in a GbE network 1 packet loss with 100 ms of latency throttles TCP throughput to 1 Mbps Applications typically affected when TCP flows are interrupted by packet loss include RDP RemoteFX RGS ICA video and audio streaming The QoE impact of packet loss on TCP includes e Low frame rates Slow file transfers e High lag e Unresponsive user interfaces HP Velocity Technology Overview 7 UDP QoE and packet loss UDP does not provide a recovery strategy for packet loss and applications that use UDP are directly impacted by even small amounts of packet loss UDP based applications typically react to packet loss by slowing down or reducing bitrate When packet loss occurs the QoE for UDP applications including PCoIP RDP VP8 SIP VoIP and video is reduced resulting in e Digital arti
4. al world IP networks introduce both latency and packet loss to application flows A primary cause of these issues is network congestion TCP retransmits lost packets providing applications with guaranteed correctly sequenced packet delivery TCP also has built in algorithms to avoid excessive congestion of the network Both latency and packet loss degrade the end user QoE especially for applications that use TCP for reliable data transmission such as video streaming chat remote desktop and file transfers This results in unresponsive user interfaces for remote desktop users extended wait times for file transfers and choppy video with reduced frame rates TCP congestion avoidance mechanisms TCP is designed to send data as rapidly as possible until it detects packet loss Once packet loss is detected TCP will guarantee delivery by retransmitting halting delivery to preserve ordered packet transmission and reducing transmission speed When packet loss dissipates TCP will again increase the speed of data delivery The speed of data delivery might be impacted by standard TCP TCP algorithms TCP can be controlled by different algorithms to accommodate different types of networks However only one network type at a time can be accommodated under native TCP For example LANs are characterized by low packet loss and high bandwidth Remote office networks typically have high packet loss and high latency WiFi networks have high jitter the la
5. data segments that are generated based on the original packet HP Velocity automatically adapts a flow s encoding mode according to the configured TLR and to the flow s current network conditions Figure 4 demonstrates how HP Velocity selects the appropriate encoding mode based on measured network loss and TLR In this case HP Velocity changes encoding modes to keep the correct loss level below a TLR of 0 04 Figure 4 Corrected loss for TLR of 0 04 0 05 0 04 347 4 2 0 03 0 02 Corrected Loss 0 01 0 00 0 00 0 25 0 50 0 75 1 00 1 25 1 50 1 75 2 00 Network Loss HP Velocity Technology Overview 9 LiveWiFi WiFi is constrained for a number of technical reasons and as a result delivers a much lower network performance experience High end consumer grade WiFi access points APs advertise that they are capable of speeds of 300 to 450 Mbps In reality WiFi capacity is much lower than advertised Figure 5 Distance signal strength The further away a WiFi enabled device is from the AP the lower the signal strength which in turn lowers the effective available throughput Noise from other devices The most common frequency used for WiFi is the 2 4GHz band which is also used for household devices such as cordless phones baby monitors and microwave ovens Throughput is degraded if any of these devices are used within range of a WiFi network Noise from other APs There are only thr
6. each flow The Network Profiler continually updates the QoS Controller on current network conditions QoS Controller The QoS Controller uses the current and trending network conditions provided by the Network Profiler to intelligently activate and adjust the optimizers Optimizers HP Velocity s optimizers work together to deliver maximum QoE 1 LiveQ Provides zero latency loss protection from end to end packet loss HP Velocity protects application flows from packet loss by automatically adapting the amount of added redundancy For more information see LiveQ on page 7 2 LiveWiFi Improves performance for congested WiFi networks and increases the efficiency of TCP over WiFi HP Velocity protects application flows by leveraging WiFi standards to minimize latency resulting in the prioritization of HP Velocity protected flows For more information see LiveWiFi on page 10 HP Velocity Technology Overview 6 3 LiveTCP Optimizes TCP throughput over all networks and provides latency mitigation for RDP RGS and ICA protocols HP Velocity improves the throughput of streaming and remote desktop applications by modifying TCP flow control mechanisms to perform better in high latency environments For more information see LiveTCP on page 13 LiveQ Packet loss occurs when one or more data packets traversing a network do not reach their destination A number of factors contribute to packet loss including signal degr
7. ee non overlapping channels that can be used by 2 4GHz WiFi In areas with a high density of APs such as a city neighborhood or an office tower it is likely that there will be several other networks using the same channel leading to speed degradation Older devices If an 802 11n enabled AP tries to connect to an older device that supports only 802 11b then the AP is forced to drop the supported speeds for everyone while the 802 11b device is operating This significantly reduces the throughput that 802 11n devices can achieve Figure 5 WiFi bandwidth constraints _ pS Noise from Other Access Points Noise from Other Devices Maximum Bandwidth ip Actual Bandwidth A n ls r Dld Devices Wa Management Overhead Wireless Contention Bi A HP Velocity Technology Overview 10 e Management overhead WiFi networks carry a significant amount of management overhead APs advertise their presence and wireless clients must regularly probe the AP to notify it that they are still there When there are a large number of WiFi devices present in a single location the management overhead becomes excessive and the capacity of the WiFi network is reduced e Acknowledgments All WiFi packets must be acknowledged by the receiver to ensure successful delivery These acknowledgment packets are sent by a WiFi device every time it receives a packet When combined with the overhead of protocols like TCP this can resu
8. ees 8 Targetiloss Rae todoo deg adhe ates bailed suche ita dt ees biie 8 Encoding Modes 0 a ia 9 A A E RR NN RN techie tinct dentin 10 WiFi prioritization ss e viii ene eee ee Ea E eee toed pe S a 11 TEP SOM WARS fete aie a 12 LiVETCP s vaste decane AS va whe eae ave we ka Seaweed ds 13 TCP congestion avoidance mechaniSMS ooococccccnr eee 13 WGP AIGOritMIMS strat ais ered Ee eva tate da di A da a IR A pend 13 TOPTANIN a a a Sees ete eee erase and zara E a ence Bre eee ae eae wea Pek Sea Die 13 LiveTCP congestion control 0 60 cee eee eee eee 13 HP Velocity technology overview Quality of Experience with HP Velocity HP Velocity is a Quality of Service QoS software engine that improves the overall Quality of Experience QoE for real time network applications Real time streaming applications delivered over data networks can be compromised by packet loss and transmission latency this results in stop and go behavior loss of interactivity and an overall reduction in the throughput of an application The experience dissatisfies application users Available on HP thin clients HP Velocity easily integrates with existing systems to improve the QoE of a streaming application by tackling the underlying problems found in today s networks packet loss latency and jitter HP Velocity automatically ensures the best end user QoE by optimizing the underlying network to meet the requirements of bandwidth intensive applications over
9. facts smeared video e Broken choppy audio e Low frame rate Packet loss protection HP Velocity protects against network loss by applying mathematical transformations to IP packets Given a single packet as an input the HP Velocity transformation will output one or more segments Each segment will logically represent a portion of the input packet and might carry additional information such as redundancy data The number of logical segments used to represent the original packet will vary based on current network loss conditions Figure 3 shows a packet being transformed and sent over the network as three distinct segments Figure 3 HP Velocity transformation of a packet Segments Packet HP Velocity Transformation Network Application Target Loss Rate Different applications are tolerant to different levels of packet loss Some applications perform poorly with a small amount of packet loss while other applications perform satisfactorily even with significant amounts of packet loss HP Velocity adjusts its operation to ensure that each application is protected from experiencing too much packet loss The Target Loss Rate TLR is the amount of loss that an application can tolerate while still delivering an acceptable QoE The default and recommended TLR for thin client applications is 0 04 HP Velocity Technology Overview 8 Encoding modes The encoding mode determines the number of logical
10. hm for each flow The optimized LiveTCP algorithm takes precedence over the native TCP algorithm Figure 7 LiveTCP algorithm in action gt Endpoint gt Native OS Native TCP Native Algorithm Optimized Stack Flow Control Stack Selection TCP Flow Terminator And Tuning Control HP Velocity Technology Overview 14 Summary HP Velocity s patented technology is available exclusively on HP thin clients It provides a seamless integrated QoE solution for both managed and unmanaged networks This allows organizations to gain valuable insight into their thin client data flows offload more expensive infrastructures such as MPLS networks to lower cost networks and achieve maximum performance regardless of network conditions The major benefits of HP Velocity include e End to end visibility of thin client data flows e In depth monitoring and reporting e Packet loss protection e Latency mitigation e WiFi acceleration e Support for all VDI protocols including RGS PCoIP RDP and ICA HP Velocity protects data flows between HP thin clients and HP Velocity enabled servers including terminal services and virtual desktops hosted by VMware Citrix and Microsoft hypervisors To obtain the HP Velocity server side components and associated documentation visit http www hp com support Select the country region from the map and then select Product Support amp Troubleshooting Type the thin client model i
11. ically calibrates congestion control parameters for each TCP flow based on the conditions present in the network Congestion detection HP Velocity automatically detects network congestion and adapts accordingly to maximize QoE WiFi acceleration HP Velocity automatically reduces latency and transmission times for wireless networks and minimizes protocol overhead resulting in improved QoE for WiFi applications Seamless HP Velocity is a transparent plug and play solution which provides integration QoE benefits to all applications and users Lightweight HP Velocity is delivered as a lightweight implementation which achieves QoE benefits while keeping system resource utilization to a minimum HP Velocity Technology Overview HP Velocity components The HP Velocity solution consists of three key components Figure 2 which form an integrated system dedicated to improving the overall QoE Figure 2 HP Velocity components Policy Engine Network Profiler s Network type s Network performance s Network conditions Optimizers L veG loss protection Controller LiveWiFl WIFI acceleration LiveTCP TCP acceleration Network Profiler The Network Profiler profiles the network path between HP Velocity enabled endpoints It identifies the type of network connectivity wired or wireless and measures key network metrics packet loss latency bandwidth constraints independently for
12. lt in 3 out of every 4 WiFi packets becoming overhead packets with only 1 out of 4 packets containing useful data e Retransmissions Not all WiFi packets are successfully received the first time they are sent A client might not receive a packet because of collisions or insufficient signal strength A single bit error in a packet will result in the retransmission of the entire WiFi packet Retransmissions might happen repeatedly for the same WiFi packet e WiFi is half duplex A wired Ethernet network is full duplex meaning that a device can send and receive or upload and download simultaneously WiFi is half duplex so if a client sends data to the AP the AP cannot send data to the same or any other client at the same time For two way communication which includes most applications used over the Internet such as video or voice chat this essentially halves throughput when compared to a full duplex technology including a wired Ethernet connection e Wireless contention When a client wants to send data and the channel is occupied the client must wait otherwise collisions will occur and the data will be corrupted Once the channel clears the client must wait even longer before it can attempt to send Similar to trying to cross a single lane bridge if there are cars wanting to cross from both directions everyone must wait their turn and there is uncertainty about whose turn is next If a user on a wireless network is using large amou
13. n the field for example t610 t510 or t410 and select Search The server side components can be downloaded HP Velocity Technology Overview 15
14. nts of bandwidth through activities such as watching a video on YouTube or downloading a file it will be more difficult and take longer for another device to send even if it is trying to do a task that requires very little data such as checking email LiveWiFi addresses these issues using WiFi prioritization and TCP over WiFi WiFi prioritization LiveWiFi awards HP Velocity traffic a higher priority than other traffic on the network Both endpoints mark HP Velocity traffic to prioritize packets moving in either direction LiveWiFi leverages the WiFi Multimedia WMM Standard to reduce packet wait times compared to other traffic in the network This results in lower latency less jitter and higher throughput HP Velocity Technology Overview 11 TCP on WiFi Standard TCP traffic acknowledgments interfere with the transmission of useful data on a WiFi network Figure 6 With LiveWiFi enabled HP Velocity modifies the rate of TCP acknowledgments to reduce protocol overhead and improve network performance This can liberate up to 15 of additional usable WiFi bandwidth Figure 6 WiFi overhead in non optimized flow LAN Guest O S e WiFi Access Point Thin Client TCP Data gt Wireless Tx useful data 4 Wireless ACK overhead TCP ACK gt Wireless Tx overhead qa Wireless ACK overhead 3 out of 4 WiFi packets are overhead HP Velocity Technology Overview 12 Live TCP Re
15. tency is highly variable and variable throughput capacity TCP Tuning Most operating systems allow only a single TCP algorithm to be active with a single set of settings If a network is optimized for LAN traffic WAN connections will be less efficient While the TCP stack can be tuned the effort required by network administrators is a deterrent LiveTCP provides tuning automatically which boosts TCP throughput over all networks and provides latency mitigation for streaming applications LiveTCP congestion control LiveTCP adapts its algorithm to automatically provide congestion control that is optimized independently for each TCP flow LAN remote network WiFi and the conditions in the network LiveTCP achieves this without requiring any intervention from IT HP Velocity Technology Overview 13 By improving on native TCP LiveTCP accelerates the speed at which thin client protocols transmit data For example RDP which is highly sensitive to latency can benefit from LiveTCP by improving transmission speeds up to 10 times RGS improvements are in the range of two to three times faster whereas ICA is up to twice as fast with LiveTCP In public networks including those at airports hotels and coffee shops where congestion is often a problem LiveTCP improves overall throughput by more effectively managing shared bandwidth Figure 7 illustrates the process by which LiveTCP independently adjusts the congestion avoidance algorit
16. wired and wireless managed and unmanaged networks By managing packet loss WiFi congestion and the impact of network latency HP Velocity improves QoS providing a better experience for the end user HP Velocity continuously monitors end to end network conditions to select the most appropriate data delivery mechanism Rich reporting capabilities enable HP Velocity to provide end to end visibility to key flow information Figure 1 The system s network monitoring and reporting tools capture in depth statistics to log files and displays them in the Management GUI for further analysis and problem detection to resolve network issues Figure 1 View of flow information for a local endpoint D HP Velocity Management Enpoint Graph Local 10 0 51 3 Remote 10 0 50 75 Ez Network Statistics Network Monitor Flow Information Configuration EP Loss Without Velocity Loss With Velocity Throughput Local CPU Usage 4 Local Memory Usage 46 Local JIRemote Local 1 04 0 00 55 71 Kbps Protected Endpoints Remote 0 40 0 00 1 23 Mbps Remote Host Product CPU Usage Memory Usage Link Latency 1 0 msec Plot Latency MEXA HP t610 WW Thin Client E Throughput E With Velocity W Without Velocity 25 3 200 2 160 Protected Flows 15 120 Remote IP Remote Port Local IP LocalPort Protocol LiveTcP LiveQ TR Encoding 10 0 50 75 1036 10 0 51 3 42966 RGS TCP Inspecting Protecting 0 04 2 1 10 0 50 75 1038 10 0 51 3
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