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Date: Fri, 6 Feb 2009 09:51:20 +0000
From: Jarek Poplawski <jarkao2@gmail.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Miller <davem@davemloft.net>, zbr@ioremap.net, w@1wt.eu,
       dada1@cosmosbay.com, ben@zeus.com, mingo@elte.hu,
       linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
       jens.axboe@oracle.com
Subject: Re: [PATCH v2] tcp: splice as many packets as possible at once
Message-ID: <20090206095119.GC4879@ff.dom.local>
References: <20090202084358.GB4129@ff.dom.local> <20090202.235017.253437221.davem@davemloft.net> <20090203094108.GA4639@ff.dom.local> <20090205.235258.257422341.davem@davemloft.net> <20090206091034.GA4879@ff.dom.local> <20090206092326.GC6645@gondor.apana.org.au>
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On Fri, Feb 06, 2009 at 08:23:26PM +1100, Herbert Xu wrote:
> On Fri, Feb 06, 2009 at 09:10:34AM +0000, Jarek Poplawski wrote:
> > 
> > Looks fine, except: you mentioned dumb NICs, which would need this
> > page space on receive, anyway. BTW, don't they need this on transmit
> > again?
> 
> A lot more NICs support SG on tx than rx.

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.

Jarek P.