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

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Message-Id: <20090203.164734.76871204.davem@davemloft.net>
Date:	Tue, 03 Feb 2009 16:47:34 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	w@....eu
Cc:	zbr@...emap.net, herbert@...dor.apana.org.au, jarkao2@...il.com,
	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

From: Willy Tarreau <w@....eu>
Date: Tue, 3 Feb 2009 13:25:35 +0100

> Well, FWIW, I've always observed better performance with 4k MTU (4080 to
> be precise) than with 9K, and I think that the overhead of allocating 3
> contiguous pages is a major reason for this.

With what hardware?  If it's with myri10ge, that driver uses page
frags so would not be using 3 contiguous pages even for jumbo frames.
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