Achieving Top Network Performance - Red Hat Summit

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Kernel Bypass Technologies – Pros and Cons●Multiple Technologies●Some Proprietary● SolarFlare OpenOnload●Coding Changes needed● RDMA
OpenOnload – ThroughputAverage Throughput, netperf<strong>Red</strong> <strong>Hat</strong> Enterprise Lunux 6.2 and Solarflare OpenOnload 201109-u2Avg Throughput (Mbps)1200010000800060004000200009446.22 9446.19 9446.08 9446.22 9446.21 9446.22 9446.22 9446.217904.175407.443436.972158.27695.8 1196.128 16 32 64 128 256 512 1K 2K 4K 8K 16K 32K 64KMessage Size (bytes)TCP Baseline UDP Baseline TCP OpenOnload UDP OpenOnload
Page 2 and 3: Achieving Top NetworkPerformanceMar
Page 4 and 5: Take Aways●●●Awareness of the
Page 6 and 7: Some Quick Disclaimers●●●We d
Page 8 and 9: Agenda● Why Bother ?●40 gbit, g
Page 10 and 11: Teaser 1 - Glustereffect of net.cor
Page 12 and 13: Teaser 3 - latency● Font size 28
Page 14 and 15: Memory Characteristics●●●Memo
Page 16 and 17: “Issues” that NUMA makes visibl
Page 18 and 19: NUMA - Latency[root@perf ~]# numact
Page 20 and 21: PCI Bus - and related issues●●
Page 22 and 23: 40 Gbit Gen3 vs 10 Gbit PCI Gen2 la
Page 24 and 25: CPU Characteristics - Basics●●
Page 26 and 27: CPU - Performance Governors●echo
Page 28 and 29: CSTATE default - C7 on this configp
Page 30 and 31: NPtcp latency vs cstates - c7 vs c0
Page 32 and 33: RHEL6 “tuned-adm” profiles# tun
Page 36 and 37: Offload - Solarflare OpenOnloadAver
Page 38 and 39: KVM Network ArchitectureVirtioConte
Page 40 and 41: KVM Network Architecture - vhost_ne
Page 42 and 43: Latency comparison - RHEL 6Network
Page 44 and 45: Host CPU Consumption virtio vs vhos
Page 46 and 47: KVM Network Architecture - PCI Devi
Page 48 and 49: KVM Network Architecture - SR-IOV
Page 50 and 51: KVM Architecture - Device Assignmen
Page 52 and 53: RHEL6 - new features●●●●●
Page 54 and 55: RHEL6 - new features●●Add getso
Page 56 and 57: Receive Steering - improved message
Page 58 and 59: Tuning Knobs - Overview●●●By
Page 60 and 61: sysctl - View and set /proc/sys set
Page 62 and 63: sysctl - TCP related settings●TCP
Page 64 and 65: Why Bother ? - Teaser 1effect of ne
Page 67 and 68: lspci - details# lspci -vvvs 81:00.
Page 69 and 70: Why Bother - A quick teaser● ifco
Page 71 and 72: Tuning- first pass bottleneck resol
Page 73 and 74: Tuning - second pass setup●●●
Page 75 and 76: Tuning - irqbalance disabled, netpe
Page 77 and 78: Tuning - second pass●mpstat on th
Page 79 and 80: Tuning - step 3●Try TCP_SENDFILE#
Page 81 and 82: Tuning - checking ethtool -S eth4
Page 83 and 84: Tuning - step 4●More buffers# ./n
Page 85 and 86:
Tuning - sanity check●Sometimes m
Page 87 and 88:
Throttling - cgroups in Action
Page 89 and 90:
Cgroup default mount points# cat /e
Page 91 and 92:
cgroups[root@dhcp1001950 ~]#
Page 93 and 94:
incorrect bindings![root@dhcp47-183
Page 95 and 96:
Throttle with cgroups●●memory
Page 97 and 98:
Network Tuning Tips●Separate netw
Page 99 and 100:
For More Information - Other talks
Page 101:
Stay connected through the Red Hat
Page 104 and 105:
Configuration Tools - System Level
Page 106 and 107:
sar - some common flags●Some comm
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