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Message-Id: <200911252050.21907.rusty@rustcorp.com.au>
Date: Wed, 25 Nov 2009 20:50:21 +1030
From: Rusty Russell <rusty@...tcorp.com.au>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Shirley Ma <mashirle@...ibm.com>,
Eric Dumazet <eric.dumazet@...il.com>,
Avi Kivity <avi@...hat.com>, netdev@...r.kernel.org,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
Hollis Blanchard <hollisb@...ibm.com>
Subject: Re: [PATCH 1/1] Defer skb allocation for both mergeable buffers and big packets in virtio_net
On Wed, 25 Nov 2009 07:45:30 pm Michael S. Tsirkin wrote:
> Hmm, is it really worth it to save a header copy if it's linear? We are
> going to access it anyway, and it fits into one cacheline nicely. On
> the other hand we have more code making life harder for compiler and
> processor.
Not sure: I think there would be many places where it would be useful.
We do a similar thing in the kernel to inspect non-linear packets, and
it's served us well.
Cheers,
Rusty.
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