netdev - Re: tcp bw in 2.6

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Message-ID: <4702C37F.4030601@hp.com>
Date:	Tue, 02 Oct 2007 15:17:35 -0700
From:	Rick Jones <rick.jones2@...com>
To:	David Miller <davem@...emloft.net>
Cc:	lm@...mover.com, torvalds@...ux-foundation.org,
	herbert@...dor.apana.org.au, wscott@...mover.com,
	netdev@...r.kernel.org
Subject: Re: tcp bw in 2.6

David Miller wrote:
> From: lm@...mover.com (Larry McVoy)
> Date: Tue, 2 Oct 2007 14:26:08 -0700
> 
> 
>>And note that sky2 doesn't have this problem.  Does the broadcom do TSO?
>>And sky2 not?  I noticed a much higher CPU load for sky2.
> 
> 
> Yes the broadcoms (the revisions I have) do TSO and it is enabled
> on both sides.
> 
> Which makes the mis-matched performance even stranger :)

Stranger still, with a mix of a 2.6.23-rc5ish kernel and a net-2.6.24 one 
(pulled oh middle of last week?) I get link-rate and I see no asymmetry between 
TCP_STREAM and TCP_MAERTS over an "e1000" link with no switch or tg3 with a 
ProCurve on my rx2660's.

I can also run bw_tcp from lmbench 3.0a8 and get 106 MB/s.

I don't have a netgear switch to try in all this...

rick jones
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