netdev - Re: tcp bw in 2.6

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Message-Id: <E1IcfN0-0007tt-00@gondolin.me.apana.org.au>
Date:	Tue, 02 Oct 2007 18:52:54 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	lm@...mover.com (Larry McVoy)
Cc:	torvalds@...ux-foundation.org, davem@...emloft.net,
	wscott@...mover.com, netdev@...r.kernel.org
Subject: Re: tcp bw in 2.6

Larry McVoy <lm@...mover.com> wrote:
>
> One of my clients also has gigabit so I played around with just that
> one and it (itanium running hpux w/ broadcom gigabit) can push the load
> as well.  One weird thing is that it is dependent on the direction the
> data is flowing.  If the hp is sending then I get 46MB/sec, if linux is
> sending then I get 18MB/sec.  Weird.  Linux is debian, running 

First of all check the CPU load on both sides to see if either
of them is saturating.  If the CPU's fine then look at the tcpdump
output to see if both receivers are using the same window settings.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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