linux-kernel - Re: [PATCH 1/2] virtio_net: Recycle some more rx buffer pages

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Message-Id: <200810161608.54017.rusty@rustcorp.com.au>
Date:	Thu, 16 Oct 2008 16:08:53 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org
Subject: Re: [PATCH 1/2] virtio_net: Recycle some more rx buffer pages

On Thursday 09 October 2008 06:34:58 Mark McLoughlin wrote:
> Each time we re-fill the recv queue with buffers, we allocate
> one too many skbs and free it again when adding fails. We should
> recycle the pages allocated in this case.
>
> A previous version of this patch made trim_pages() trim trailing
> unused pages from skbs with some paged data, but this actually
> caused a barely measurable slowdown.

Yes, I noticed a similar effect.  Not quite sure why though.

Applied.

Thanks!
Rusty.
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