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From: Luca Bigliardi <shammash@artha.org>
To: Dor Laor <dlaor@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>, kvm@vger.kernel.org
Subject: Re: kvm network latency, higher with virtio ?
Date: Thu, 17 Sep 2009 18:58:13 +0200	[thread overview]
Message-ID: <20090917165813.GB22518@esaurito.net> (raw)
In-Reply-To: <4AB0A60B.3090207@redhat.com>

On Wed, Sep 16, 2009 at 11:47:07AM +0300, Dor Laor wrote:

Hi!
Thank you for explaining.

> Measurements of older versions of virtio proved that we can cancel this  
> timer and achieve better latency while not hurting throughput.

Well, I did try the patch Michael is suggesting here:
http://lkml.org/lkml/2009/8/17/140

And I should say that in my testing environment not only the throughput doesn't
decrease, but in some cases it grows (tested using netperf with udp-stream).

> Vhost wouldn't use it. For the time being until be get vhost, we should  
> probably remove it from qemu.

Yes please, check with your tests and consider this.


Thank you,

Luca


      reply	other threads:[~2009-09-17 17:38 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-15 15:15 kvm network latency, higher with virtio ? Luca Bigliardi
2009-09-16  7:27 ` Michael S. Tsirkin
2009-09-16  8:47   ` Dor Laor
2009-09-17 16:58     ` Luca Bigliardi [this message]

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