Achieving Top Network Performance - Red Hat Summit

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Memory Characteristics●●●Memory Speed is crucial● Faster is betterUnderstand layout and its impact●On middle age systems, fully populating the memory will slow itdownTriple check your BIOS settings● Make sure that you pick settings for optimalperformance
What is NUMA ?●●●NUMA – Non Uniform Memory Architecture●Make bigger systems scalable by distributing systemmemory near individual CPUsNUMA has been around for a long time●●In the past was in specialized high end systemsnow the norm across the board for serversMost current multi-socket systems...●Recent AMD systems have 2 nodes / socket
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 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 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●●●
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Tuning - irqbalance disabled, netpe
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Tuning - second pass●mpstat on th
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Tuning - step 3●Try TCP_SENDFILE#
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Tuning - checking ethtool -S eth4
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Tuning - step 4●More buffers# ./n
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Tuning - sanity check●Sometimes m
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Throttling - cgroups in Action
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Cgroup default mount points# cat /e
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cgroups[root@dhcp1001950 ~]#
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incorrect bindings![root@dhcp47-183
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Throttle with cgroups●●memory
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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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Achieving Top Network Performance - Red Hat Summit

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