From: Rusty Russell <rusty@rustcorp.com.au>
To: virtualization@lists.linux-foundation.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Anthony Liguori <anthony@codemonkey.ws>,
avi@redhat.com, kvm@vger.kernel.org
Subject: Re: [PATCH 0/3] qemu-kvm: vhost net support
Date: Thu, 20 Aug 2009 16:49:47 +0930 [thread overview]
Message-ID: <200908201649.48082.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20090812173548.GA29981@redhat.com>
On Thu, 13 Aug 2009 03:05:48 am Michael S. Tsirkin wrote:
> On Mon, Aug 10, 2009 at 03:51:12PM -0500, Anthony Liguori wrote:
> > Any rough idea on performance? Better or worse than userspace?
>
> Well, I definitely see some gain in latency.
...
> Part of it might be that tx mitigation does not come into play with vhost. I
> need to disable it in qemu and see.
A simple test I've found reasonably indicative when looking at base performance (before stuff like TSO get involved) is to do pings. Throughput with "ping -s 1024 -l 120 -c 1000000 -f -q" and latency with "ping -c 1000000 -f -q".
(You may need to cut -l down if your ring is too small).
Cheers,
Rusty.
next prev parent reply other threads:[~2009-08-20 7:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-10 19:23 [PATCH 0/3] qemu-kvm: vhost net support Michael S. Tsirkin
2009-08-10 20:51 ` Anthony Liguori
2009-08-12 17:35 ` Michael S. Tsirkin
2009-08-19 8:11 ` Or Gerlitz
2009-08-20 7:19 ` Rusty Russell [this message]
2009-08-20 13:41 ` Michael S. Tsirkin
2009-08-20 17:00 ` Michael S. Tsirkin
2009-08-20 17:24 ` Avi Kivity
2009-08-20 17:49 ` Michael S. Tsirkin
2009-08-12 20:27 ` Gregory Haskins
2009-08-13 5:59 ` Michael S. Tsirkin
2009-08-13 11:35 ` Gregory Haskins
2009-08-13 11:53 ` Michael S. Tsirkin
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