netdev - Re: [RFC PATCH 1/1] vhost: TX used buffer guest signal accumulation

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Message-ID: <1288906643.16508.0.camel@localhost.localdomain>
Date:	Thu, 04 Nov 2010 14:37:23 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] vhost: TX used buffer guest signal accumulation

On Thu, 2010-11-04 at 11:30 +0200, Michael S. Tsirkin wrote:
> One thing to note is that deferred signalling needs to be
> benchmarked with old guests which don't orphan skbs on xmit
> (or disable orphaning in both networking stack and virtio-net).

Yes, we need run more test.

> 
> OK, so I guess I'll queue the __put_user etc patches for net-next, on
> top of this
> I think a patch which defers signalling would be nice to have,
> then we can figure out whether a separate heads array still has
> benefits
> for non zero copy case: if yes what they are, if no whether it should
> be
> used for zero copy only for both both non-zero copy and zero copy.
> 
> Makes sense? 

Agree.

Shirley

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