Achieving Top Network Performance - Red Hat Summit

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NUMA - Latency[root@perf ~]# numactl --hardwareavailable: 4 nodes (0-3)node 0 cpus: 0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60node 0 size: 32649 MBnode 0 free: 30868 MBnode 1 cpus: 1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61node 1 size: 32768 MBnode 1 free: 29483 MBnode 2 cpus: 2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62node 2 size: 32768 MBnode 2 free: 31082 MBnode 3 cpus: 3 7 11 15 19 23 27 31 35 39 43 47 51 55 59 63node 3 size: 32768 MBnode 3 free: 31255 MBnode distances:node 0 1 2 30: 10 21 21 211: 21 10 21 212: 21 21 10 213: 21 21 21 10
Numa – Latency●Sample inter-NUMA-node relative latency:● Intel 4 socket / 4 node: 1.5x● AMD 4 socket / 8 node: 2.7x● 8 socket / 8 node: 2.8x● 32 node blade system: 5.5x
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 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●●●
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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