netdev - Re: e1000 full-duplex TCP performance well below wire speed

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Message-ID: <Pine.LNX.4.63.0801310358300.3240@trinity.phys.uwm.edu>
Date:	Thu, 31 Jan 2008 03:59:12 -0600 (CST)
From:	Bruce Allen <ballen@...vity.phys.uwm.edu>
To:	Andi Kleen <andi@...stfloor.org>
cc:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	netdev@...r.kernel.org,
	Carsten Aulbert <carsten.aulbert@....mpg.de>,
	Henning Fehrmann <henning.fehrmann@....mpg.de>,
	Bruce Allen <bruce.allen@....mpg.de>
Subject: Re: e1000 full-duplex TCP performance well below wire speed

Hi Andi!

>> Important note: we ARE able to get full duplex wire speed (over 900
>> Mb/s simulaneously in both directions) using UDP.  The problems occur
>> only with TCP connections.
>
> Another issue with full duplex TCP not mentioned yet is that if TSO is used
> the output  will be somewhat bursty and might cause problems with the
> TCP ACK clock of the other direction because the ACKs would need
> to squeeze in between full TSO bursts.
>
> You could try disabling TSO with ethtool.

Noted.  We'll try this also.

Cheers,
 	Bruce
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