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

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Message-ID: <20090203122839.GA9393@gondor.apana.org.au>
Date:	Tue, 3 Feb 2009 23:28:39 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Willy Tarreau <w@....eu>
Cc:	Evgeniy Polyakov <zbr@...emap.net>,
	Jarek Poplawski <jarkao2@...il.com>,
	David Miller <davem@...emloft.net>, 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 Tue, Feb 03, 2009 at 01:25:35PM +0100, Willy Tarreau wrote:
>
> > So:
> > 1. copy the whole jumbo skb into fragmented one
> > 2. reduce the MTU
> 
> you'll not reduce MTU of established connections though. And trying to
> advertise MSS changes in the middle of a TCP connection is an awful
> hack which I think will not work everywhere.

Not to mention that Ethernet isn't just IP, so the protocol that
is being used might not have a concept of path MTU discovery at
all.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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