Achieving Top Network Performance - Red Hat Summit

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Verify correct bindings[root@dhcp47-183 test]# echo 0 > cpuset.mems[root@dhcp47-183 test]# echo 0-3 > cpuset.cpus[root@dhcp47-183 test]# numastatnode0 node1numa_hit 1648772 438778numa_miss 23459 2134520local_node 1648648 423162other_node 23583 2150136[root@dhcp47-183 test]# /common/lwoodman/code/memory 4faulting took 1.616062stouching took 0.364937s[root@dhcp47-183 test]# numastatnode0 node1numa_hit 2700423 439550numa_miss 23459 2134520local_node 2700299 423934other_node 23583 2150136
incorrect bindings![root@dhcp47-183 test]# echo 1 > cpuset.mems[root@dhcp47-183 test]# echo 0-3 > cpuset.cpus[root@dhcp47-183 test]# numastatnode0 node1numa_hit 1623318 434106numa_miss 23459 1082458local_node 1623194 418490other_node 23583 1098074[root@dhcp47-183 test]# /common/lwoodman/code/memory 4faulting took 1.976627stouching took 0.454322s[root@dhcp47-183 test]# numastatnode0 node1numa_hit 1623341 434147numa_miss 23459 2133738local_node 1623217 418531other_node 23583 2149354
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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
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NUMA - Latency[root@perf ~]# numact
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PCI Bus - and related issues●●
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40 Gbit Gen3 vs 10 Gbit PCI Gen2 la
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CPU Characteristics - Basics●●
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CPU - Performance Governors●echo
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CSTATE default - C7 on this configp
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NPtcp latency vs cstates - c7 vs c0
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RHEL6 “tuned-adm” profiles# tun
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Kernel Bypass Technologies - Pros a
Page 36 and 37:
Offload - Solarflare OpenOnloadAver
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KVM Network ArchitectureVirtioConte
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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: cgroups[root@dhcp1001950 ~]#
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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Achieving Top Network Performance - Red Hat Summit

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