Achieving Top Network Performance - Red Hat Summit

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Cgroup how-to1GB/2CPU subset of a 16GB/8CPU system#numactl --hardware#mount -t cgroup xxx /cgroups#mkdir -p /cgroups/test#cd /cgroups/test#echo 1 > cpuset.mems#echo 2-3 > cpuset.cpus#echo 1G > memory.limit_in_bytes#echo $$ > tasks
cgroups[root@dhcp1001950 ~]# forkoff 20MB 100procs &[root@dhcp1001950 ~]# top d 5top 12:24:13 up 1:36, 4 users, load average: 22.70, 5.32, 1.79Tasks: 315 total, 93 running, 222 sleeping, 0 stopped, 0 zombieCpu0 : 0.0%us, 0.2%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%stCpu1 : 0.0%us, 0.2%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%stCpu2 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%stCpu3 : 89.6%us, 10.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.2%hi, 0.2%si, 0.0%stCpu4 : 0.4%us, 0.6%sy, 0.0%ni, 98.8%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%stCpu5 : 0.4%us, 0.0%sy, 0.0%ni, 99.2%id, 0.0%wa, 0.0%hi, 0.4%si, 0.0%stCpu6 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%stCpu7 : 0.0%us, 0.0%sy, 0.0%ni, 99.8%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%stMem: 16469476k total, 1993064k used, 14476412k free,33740k buffersSwap: 2031608k total, 185404k used, 1846204k free, 459644k cached
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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
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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
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CSTATE default - C7 on this configp
Page 30 and 31:
NPtcp latency vs cstates - c7 vs c0
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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●●●
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: Cgroup default mount points# cat /e
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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