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Date: Thu, 4 Feb 2016 12:13:11 -0800 From: Tom Herbert <tom@...bertland.com> To: Rick Jones <rick.jones2@....com> Cc: Linux Kernel Network Developers <netdev@...r.kernel.org> Subject: Re: Disabling XPS for 4.4.0-1+ixgbe+OpenStack VM over a VLAN means 65% increase in netperf TCP_STREAM On Thu, Feb 4, 2016 at 11:57 AM, Rick Jones <rick.jones2@....com> wrote: > On 02/04/2016 11:38 AM, Tom Herbert wrote: >> >> On Thu, Feb 4, 2016 at 11:13 AM, Rick Jones <rick.jones2@....com> wrote: >>> >>> The Intel folks suggested something about the process scheduler moving >>> the >>> sender around and ultimately causing some packet re-ordering. That could >>> I >>> suppose explain the TCP_STREAM difference, but not the TCP_RR since that >>> has >>> just a single segment in flight at one time. >>> >> XPS has OOO avoidance for TCP, that should not be a problem. > > > What/how much should I read into: > > With XPS TCPOFOQueue: 78206 > Without XPS TCPOFOQueue: 967 > > out of the netstat statistics on the receiving VM? > Okay, that makes sense. The OOO avoidance only applies to TCP sockets in the stack, that doesn't cross into VM. Presumably, packets coming from the VM don't have a socket so sk_tx_queue_get always returns -1 and so netdev_pick_tx will steer packet to the queue based on currently running CPU without any memory. >>> I can try to get perf/whatnot installed on the systems - suggestions as >>> to >>> what metrics to look at are welcome. >>> >> I'd start with verifying the XPS configuration is sane and then trying >> to reproduce the issue outside of using VMs, if both of those are okay >> then maybe look at some sort of bad interaction with OpenStack >> configuration. > > > Fair enough - what is the definition of "sane" for an XPS configuration? > > Here is what it looks like before I disabled it: > > $ for i in `find /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0 > -name xps_cpus`; do echo $i `cat $i`; done > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-0/xps_cpus > 0000,00000001 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-1/xps_cpus > 0000,00000002 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-2/xps_cpus > 0000,00000004 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-3/xps_cpus > 0000,00000008 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-4/xps_cpus > 0000,00000010 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-5/xps_cpus > 0000,00000020 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-6/xps_cpus > 0000,00000040 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-7/xps_cpus > 0000,00000080 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-8/xps_cpus > 0000,00000100 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-9/xps_cpus > 0000,00000200 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-10/xps_cpus > 0000,00000400 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-11/xps_cpus > 0000,00000800 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-12/xps_cpus > 0000,00001000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-13/xps_cpus > 0000,00002000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-14/xps_cpus > 0000,00004000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-15/xps_cpus > 0000,00008000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-16/xps_cpus > 0000,00010000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-17/xps_cpus > 0000,00020000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-18/xps_cpus > 0000,00040000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-19/xps_cpus > 0000,00080000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-20/xps_cpus > 0000,00100000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-21/xps_cpus > 0000,00200000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-22/xps_cpus > 0000,00400000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-23/xps_cpus > 0000,00800000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-24/xps_cpus > 0000,01000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-25/xps_cpus > 0000,02000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-26/xps_cpus > 0000,04000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-27/xps_cpus > 0000,08000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-28/xps_cpus > 0000,10000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-29/xps_cpus > 0000,20000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-30/xps_cpus > 0000,40000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-31/xps_cpus > 0000,80000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-32/xps_cpus > 0001,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-33/xps_cpus > 0002,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-34/xps_cpus > 0004,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-35/xps_cpus > 0008,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-36/xps_cpus > 0010,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-37/xps_cpus > 0020,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-38/xps_cpus > 0040,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-39/xps_cpus > 0080,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-40/xps_cpus > 0100,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-41/xps_cpus > 0200,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-42/xps_cpus > 0400,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-43/xps_cpus > 0800,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-44/xps_cpus > 1000,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-45/xps_cpus > 2000,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-46/xps_cpus > 4000,00000000 > /sys/devices/pci0000:00/0000:00:02.2/0000:04:00.0/net/eth0/queues/tx-47/xps_cpus > 8000,00000000 > > > Which looks like it simply got spread across all the "CPUs" (HTs included) > in the system. > > happy benchmarking, > > rick jones
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