Achieving Top Network Performance - Red Hat Summit

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sar – some common flags●Some common flags for sar●Adding E gets failure stats● # sar -n EDEV - View failure statistics for interfaces● # sar -n NFS - View NFS client activity for interfaces● # sar -n NFSD - View NFS server activity for interfaces● # sar -n (E)IP - View IPv4 activity for interfaces● # sar -n (E)ICMP - View ICMPv4 activity for interfaces● # sar -n (E)TCP - View TCPv4 activity for interfaces
ethtool – View and change Ethernet card settings●Works mostly at the HW level●●●●●ethtool -S – provides HW level stats●Counters since boot time, create scripts to calculate diffsethtool -c - Interrupt coalescingethtool -g - provides ring buffer informationethtool -k - provides hw assist informationethtool -i - provides the driver information
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Achieving Top NetworkPerformanceMar
Page 4 and 5:
Take Aways●●●Awareness of the
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Some Quick Disclaimers●●●We d
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Agenda● Why Bother ?●40 gbit, g
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Teaser 1 - Glustereffect of net.cor
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Teaser 3 - latency● Font size 28
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Memory Characteristics●●●Memo
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“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
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Offload - Solarflare OpenOnloadAver
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KVM Network ArchitectureVirtioConte
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KVM Network Architecture - vhost_ne
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Latency comparison - RHEL 6Network
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Host CPU Consumption virtio vs vhos
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KVM Network Architecture - PCI Devi
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KVM Network Architecture - SR-IOV
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KVM Architecture - Device Assignmen
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RHEL6 - new features●●●●●
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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
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