Achieving Top Network Performance - Red Hat Summit

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Tuning Knobs – Overview●●●By default, Linux networking not tuned for maxperformance, more for reliability● Remember that Linux “autotunes” buffers forconnections● Don't forget UDP !Try via command line●When you are happy with the results, add to /etc/sysctl.confLook at documentation in /usr/src
sysctl – View and set /proc/sys settings● sysctl -a - lists all variables● sysctl -q - queries a variable● sysctl -w - writes a variable
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 34 and 35: Kernel Bypass Technologies - Pros a
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 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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