netdev - Re: poor network loopback performance and scalability

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Message-Id: <20080421.032200.209759978.davem@davemloft.net>
Date:	Mon, 21 Apr 2008 03:22:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	mingo@...e.hu, dada1@...mosbay.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl
Subject: Re: poor network loopback performance and scalability

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 21 Apr 2008 18:19:08 +0800

> I belive the current value is a legacy from the days when we didn't
> support skb page frags so everything had to be physically contiguous.

It's legacy from when my top-of-the-line UltraSPARC-I 130Mhz cpus
got the best loopback results using that value :-)
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