From: Sasha Levin <levinsasha928@gmail.com>
To: Avi Kivity <avi@redhat.com>
Cc: markmc@redhat.com, kvm@vger.kernel.org,
"Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH] virtio-ring: Use threshold for switching to indirect descriptors
Date: Wed, 30 Nov 2011 18:17:22 +0200 [thread overview]
Message-ID: <1322669842.3985.10.camel@lappy> (raw)
In-Reply-To: <1322669511.3985.8.camel@lappy>
Sorry, I forgot to copy-paste one of the results :)
On Wed, 2011-11-30 at 18:11 +0200, Sasha Levin wrote:
> I did some testing of indirect descriptors under different workloads.
>
> All tests were on a 2 vcpu guest with vhost on. Simple TCP_STREAM using
> netperf.
>
> Indirect desc off:
> guest -> host, 1 stream: ~4600mb/s
> host -> guest, 1 stream: ~5900mb/s
> guest -> host, 8 streams: ~620mb/s (on average)
> host -> guest, 8 stream: ~600mb/s (on average)
>
> Indirect desc on:
> guest -> host, 1 stream: ~4900mb/s
> host -> guest, 1 stream: ~5400mb/s
> guest -> host, 8 streams: ~620mb/s (on average)
> host -> guest, 8 stream: ~600mb/s (on average)
Should be:
host -> guest, 8 stream: ~515mb/s (on average)
>
> Which means that for one stream, guest to host gets faster while host to
> guest gets slower when indirect descriptors are on.
>
--
Sasha.
WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <levinsasha928@gmail.com>
To: Avi Kivity <avi@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
markmc@redhat.com
Subject: Re: [PATCH] virtio-ring: Use threshold for switching to indirect descriptors
Date: Wed, 30 Nov 2011 18:17:22 +0200 [thread overview]
Message-ID: <1322669842.3985.10.camel@lappy> (raw)
In-Reply-To: <1322669511.3985.8.camel@lappy>
Sorry, I forgot to copy-paste one of the results :)
On Wed, 2011-11-30 at 18:11 +0200, Sasha Levin wrote:
> I did some testing of indirect descriptors under different workloads.
>
> All tests were on a 2 vcpu guest with vhost on. Simple TCP_STREAM using
> netperf.
>
> Indirect desc off:
> guest -> host, 1 stream: ~4600mb/s
> host -> guest, 1 stream: ~5900mb/s
> guest -> host, 8 streams: ~620mb/s (on average)
> host -> guest, 8 stream: ~600mb/s (on average)
>
> Indirect desc on:
> guest -> host, 1 stream: ~4900mb/s
> host -> guest, 1 stream: ~5400mb/s
> guest -> host, 8 streams: ~620mb/s (on average)
> host -> guest, 8 stream: ~600mb/s (on average)
Should be:
host -> guest, 8 stream: ~515mb/s (on average)
>
> Which means that for one stream, guest to host gets faster while host to
> guest gets slower when indirect descriptors are on.
>
--
Sasha.
next prev parent reply other threads:[~2011-11-30 16:17 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-29 9:33 [PATCH] virtio-ring: Use threshold for switching to indirect descriptors Sasha Levin
2011-11-29 9:33 ` Sasha Levin
2011-11-29 12:56 ` Michael S. Tsirkin
2011-11-29 12:56 ` Michael S. Tsirkin
2011-11-29 13:34 ` Sasha Levin
2011-11-29 13:34 ` Sasha Levin
2011-11-29 13:54 ` Michael S. Tsirkin
2011-11-29 14:21 ` Sasha Levin
2011-11-29 14:21 ` Sasha Levin
2011-11-29 14:54 ` Michael S. Tsirkin
2011-11-29 14:54 ` Michael S. Tsirkin
2011-11-29 14:58 ` Avi Kivity
2011-11-29 14:58 ` Avi Kivity
2011-11-30 16:11 ` Sasha Levin
2011-11-30 16:11 ` Sasha Levin
2011-11-30 16:17 ` Sasha Levin [this message]
2011-11-30 16:17 ` Sasha Levin
2011-12-01 2:42 ` Rusty Russell
2011-12-01 2:42 ` Rusty Russell
2011-12-01 7:58 ` Michael S. Tsirkin
2011-12-01 7:58 ` Michael S. Tsirkin
2011-12-01 8:09 ` Sasha Levin
2011-12-01 8:09 ` Sasha Levin
2011-12-01 10:26 ` Michael S. Tsirkin
2011-12-01 10:26 ` Michael S. Tsirkin
2011-12-02 0:46 ` Rusty Russell
2011-12-02 0:46 ` Rusty Russell
2011-12-03 11:50 ` Sasha Levin
2011-12-03 11:50 ` Sasha Levin
2011-12-04 11:06 ` Michael S. Tsirkin
2011-12-04 11:06 ` Michael S. Tsirkin
2011-12-04 15:15 ` Michael S. Tsirkin
2011-12-04 15:15 ` Michael S. Tsirkin
2011-12-04 11:52 ` Avi Kivity
2011-12-04 11:52 ` Avi Kivity
2011-12-04 12:01 ` Michael S. Tsirkin
2011-12-04 12:01 ` Michael S. Tsirkin
2011-12-04 12:06 ` Avi Kivity
2011-12-04 12:06 ` Avi Kivity
2011-12-04 15:11 ` Michael S. Tsirkin
2011-12-04 15:11 ` Michael S. Tsirkin
2011-12-04 15:16 ` Avi Kivity
2011-12-04 15:16 ` Avi Kivity
2011-12-04 16:00 ` Michael S. Tsirkin
2011-12-04 16:00 ` Michael S. Tsirkin
2011-12-04 16:33 ` Avi Kivity
2011-12-04 16:33 ` Avi Kivity
2011-12-05 0:10 ` Rusty Russell
2011-12-05 0:10 ` Rusty Russell
2011-12-05 9:52 ` Avi Kivity
2011-12-05 9:52 ` Avi Kivity
2011-12-06 5:07 ` Rusty Russell
2011-12-06 5:07 ` Rusty Russell
2011-12-06 9:58 ` Avi Kivity
2011-12-06 9:58 ` Avi Kivity
2011-12-06 12:03 ` Rusty Russell
2011-12-07 13:37 ` Avi Kivity
2011-12-07 13:37 ` Avi Kivity
2011-12-06 12:03 ` Rusty Russell
2011-12-04 12:13 ` Sasha Levin
2011-12-04 12:13 ` Sasha Levin
2011-12-04 16:22 ` Michael S. Tsirkin
2011-12-04 16:22 ` Michael S. Tsirkin
2011-12-04 17:34 ` Sasha Levin
2011-12-04 17:34 ` Sasha Levin
2011-12-04 17:37 ` Avi Kivity
2011-12-04 17:37 ` Avi Kivity
2011-12-04 17:39 ` Sasha Levin
2011-12-04 17:39 ` Sasha Levin
2011-12-04 18:23 ` Sasha Levin
2011-12-04 18:23 ` Sasha Levin
2011-12-07 14:02 ` Sasha Levin
2011-12-07 14:02 ` Sasha Levin
2011-12-07 15:48 ` Michael S. Tsirkin
2011-12-07 15:48 ` Michael S. Tsirkin
2011-12-08 9:44 ` Rusty Russell
2011-12-08 10:37 ` Sasha Levin
2011-12-08 10:37 ` Sasha Levin
2011-12-09 5:33 ` Rusty Russell
2011-12-09 5:33 ` Rusty Russell
2011-12-08 9:44 ` Rusty Russell
2011-11-29 13:54 ` Michael S. Tsirkin
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