netdev - Re: AlacrityVM benchmark numbers updated

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Message-ID: <4A9595A5.9060809@gmail.com>
Date:	Wed, 26 Aug 2009 16:05:57 -0400
From:	Gregory Haskins <gregory.haskins@...il.com>
To:	Avi Kivity <avi@...hat.com>
CC:	alacrityvm-devel@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org
Subject: Re: AlacrityVM benchmark numbers updated

Avi Kivity wrote:
> On 08/26/2009 09:42 PM, Gregory Haskins wrote:
>> Actually, I have already look at this and it does indeed seem better to
>> use switch_mm+gupf() over gup() by quite a large margin.  You could then
>> couple that with your DMA-engine idea to potentially gain even more
>> benefits (though probably not for networking since most NICs have their
>> own DMA engine anyway).
>>
>>    
> 
> For tx, we'll just go copyless once we plumb the destructors properly. 
> But for rx on a shared interface it is impossible to avoid the copy. 
> You can only choose if you want it done by the cpu or a local dma engine.
> 
> 

Yep, agree on both counts.

-Greg


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