Achieving Top Network Performance - Red Hat Summit
Achieving Top Network Performance - Red Hat Summit Achieving Top Network Performance - Red Hat Summit
RHEL6 “tuned-adm” profiles# tuned-adm listAvailable profiles:- default- latency-performance- throughput-performance- enterprise-storage- virtual-host, virtual-guest *Example# tuned-adm profile enterprise-storage* NEW for RHEL6.3
tuned profiles – virtual-host/guest new RHEL6.3kernel.sched_min_granularity_nskernel.sched_wakeup_granularity_nsTunable default latencyperformancethroughputperformanceenterprisestoragevirtual-host4ms 10ms 10ms 10ms 10ms4ms 15ms 15ms 15ms 15msvm.dirty_ratio 20% RAM 40% 40% 10% 40%vm.dirty_background_ratio10% RAM 5%vm.swappiness 60 10 30I/O Scheduler(Elevator)FilesystemBarriersvirtual-guestCFQ deadline deadline deadline deadline deadlineOn Off Off OffCPU Governor ondemand performance performanceperformance performance performanceDisk Read-ahead 4x 4x 4x
- 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 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 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
RHEL6 “tuned-adm” profiles# tuned-adm listAvailable profiles:- default- latency-performance- throughput-performance- enterprise-storage- virtual-host, virtual-guest *Example# tuned-adm profile enterprise-storage* NEW for RHEL6.3
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