linux-kernel - Re: poor network loopback performance and scalability (was: Re: [RFC,PATCH] loopback: calls netif_receive_skb() instead of netif

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Message-Id: <E1JnmdQ-0001qO-00@gondolin.me.apana.org.au>
Date:	Mon, 21 Apr 2008 11:24:04 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	mingo@...e.hu (Ingo Molnar)
Cc:	davem@...emloft.net, 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 (was: Re:	[RFC,PATCH] loopback: calls netif_receive_skb() instead of	netif_rx())

Ingo Molnar <mingo@...e.hu> wrote:
> 
>   # ifconfig lo mtu 1048576

Chiming in late here, but 1048576 can't possibly work with IP
which uses a 16-bit quantity as the length header.  In fact a
quick test seems to indicate that an 1048576 mtu doesn't generate
anything bigger than the default 16K mtu.

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