netdev - Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

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Message-ID: <4B3211A3.1090202@redhat.com>
Date:	Wed, 23 Dec 2009 14:48:35 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Gregory Haskins <gregory.haskins@...il.com>,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org,
	"alacrityvm-devel@...ts.sourceforge.net" 
	<alacrityvm-devel@...ts.sourceforge.net>,
	Chris Wright <chrisw@...hat.com>
Subject: Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

On 12/23/2009 02:14 PM, Andi Kleen wrote:
>> http://www.redhat.com/f/pdf/summit/cwright_11_open_source_virt.pdf
>>
>> See slide 32.  This is without vhost-net.
>>      
> Thanks. Do you also have latency numbers?
>    

No.  Copying Chris.  This was with the tx mitigation timer disabled, so 
you won't see the usual atrocious userspace virtio latencies, but it 
won't be as good as a host kernel implementation since we take a 
heavyweight exit and qemu is pretty unoptimized.

> It seems like there's definitely still potential for improvement
> with messages<4K. But for the large messages they indeed
> look rather good.
>    

There's still a lot of optimization to be done, but I hope this proves 
there is nothing inherently slow about virtio.

-- 
error compiling committee.c: too many arguments to function

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