netdev - Re: [PATCH 0/4] Implement persistent grant in xen-netfront/netback

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Date:	Sat, 17 Nov 2012 12:39:21 +0800
From:	annie li <annie.li@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
Subject: Re: [PATCH 0/4] Implement persistent grant in xen-netfront/netback



On 2012-11-16 19:46, Ian Campbell wrote:
>
> It seems like having netfront simply allocate itself a pool of grant
> references which it reuses would give equivalent benefits whilst being a
> smaller patch, with no protocol change and avoiding double copying. In
> fact by avoiding the double copy I'd expect it to be even better.
>
>   

OK, I can try this implementation.
And I'd better to compare the performance between double copy and this 
implementation to see how much grant lock affects grant copy too.

> I think you need to measure both dom0->domU and domU->dom0 to get the
> full picture since AIUI netperf sends the bulk data in only one
> direction with just ACKs coming back the other way.
>   
Yes.
My environment does not meet requirement of more VMs, I would do more 
thorough test after Konrad setups the environment.

Thanks
Annie
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