netdev - Re: [PATCH v2] tcp: splice as many packets as possible at once

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Message-ID: <20090206105807.GD4879@ff.dom.local>
Date:	Fri, 6 Feb 2009 10:58:07 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, zbr@...emap.net, w@....eu,
	dada1@...mosbay.com, ben@...s.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH v2] tcp: splice as many packets as possible at once

On Fri, Feb 06, 2009 at 09:28:22PM +1100, Herbert Xu wrote:
> On Fri, Feb 06, 2009 at 09:51:20AM +0000, Jarek Poplawski wrote:
> >
> > OK, but since there is not so much difference, and we need to waste
> > it in some cases anyway, plus handle it later some special way, I'm
> > a bit in doubt.
> 
> Well the thing is cards that don't support SG on tx probably
> don't support jumbo frames either.

?? I mean this 128 byte chunk would be hard to reuse after copying
to skb->data, and if reused, we could miss this for some NICs on TX,
so the whole packed would need a copy.

BTW, David mentioned something simple like sk_sndmsg_page would be
enough, but I guess not for these non-SG NICs. We have to allocate
bigger chunks for them, so more fragmentation to handle.

Cheers,
Jarek P.
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