Achieving Top Network Performance - Red Hat Summit
Achieving Top Network Performance - Red Hat Summit Achieving Top Network Performance - Red Hat Summit
sysctl – TCP related settings●TCP Memory Allocations - min/pressure/max● net.ipv4.tcp_rmem - TCP read buffer - in bytes●●●overriden by core.rmem_maxnet.ipv4.tcp_wmem - TCP write buffer - in bytes●overridden by core/wmem_maxnet.ipv4.tcp_mem - TCP buffer space● measured in pages, not bytes !
sysctl – ”core” memory settings●CORE memory settings● net.core.(r/w)mem_max●●●●max size of (r/w)x socket buffernet.core.(r/w)mem_default●default (r/w)x size of socket buffernet.core.optmem_max●maximum amount of option memory buffersnet.core.netdev_max_backlog●how many unprocessed rx packets before kernel starts to dropthem● These settings also impact UDP !
- 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 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 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
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