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Date: Wed, 29 Aug 2012 17:03:03 +0200 From: Sasha Levin <levinsasha928@...il.com> To: "Michael S. Tsirkin" <mst@...hat.com> CC: rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, avi@...hat.com, kvm@...r.kernel.org Subject: Re: [PATCH v2 2/2] virtio-ring: Allocate indirect buffers from cache when possible On 08/29/2012 01:07 PM, Michael S. Tsirkin wrote: > On Tue, Aug 28, 2012 at 03:35:00PM +0200, Sasha Levin wrote: >> On 08/28/2012 03:20 PM, Michael S. Tsirkin wrote: >>> On Tue, Aug 28, 2012 at 03:04:03PM +0200, Sasha Levin wrote: >>>> Currently if VIRTIO_RING_F_INDIRECT_DESC is enabled we will >>>> use indirect descriptors and allocate them using a simple >>>> kmalloc(). >>>> >>>> This patch adds a cache which will allow indirect buffers under >>>> a configurable size to be allocated from that cache instead. >>>> >>>> Signed-off-by: Sasha Levin <levinsasha928@...il.com> >>> >>> I imagine this helps performance? Any numbers? >> >> I ran benchmarks on the original RFC, I've re-tested it now and got similar >> numbers to the original ones (virtio-net using vhost-net, thresh=16): >> >> Before: >> Recv Send Send >> Socket Socket Message Elapsed >> Size Size Size Time Throughput >> bytes bytes bytes secs. 10^6bits/sec >> >> 87380 16384 16384 10.00 4512.12 >> >> After: >> Recv Send Send >> Socket Socket Message Elapsed >> Size Size Size Time Throughput >> bytes bytes bytes secs. 10^6bits/sec >> >> 87380 16384 16384 10.00 5399.18 >> >> >> Thanks, >> Sasha > > This is with both patches 1 + 2? > Sorry could you please also test what happens if you apply > - just patch 1 > - just patch 2 > > Thanks! Sure thing! I've also re-ran it on a IBM server type host instead of my laptop. Here are the results: Vanilla kernel: MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.33.1 () port 0 AF_INET enable_enobufs failed: getprotobyname Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 7922.72 Patch 1, with threshold=16: MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.33.1 () port 0 AF_INET enable_enobufs failed: getprotobyname Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 8415.07 Patch 2: MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.33.1 () port 0 AF_INET enable_enobufs failed: getprotobyname Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 8931.05 Note that these are simple tests with netperf listening on one end and a simple 'netperf -H [host]' within the guest. If there are other tests which may be interesting please let me know. Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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