Subject: Re: [PATCH 1/1] Defer skb allocation for both mergeable buffers and big packets in virtio_net

From: Rusty Russell <[email-masked]>
Date: Wed, 25 Nov 2009 20:50:21 +1030

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.