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

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Message-ID: <Pine.LNX.4.63.0801311328030.14403@trinity.phys.uwm.edu>
Date:	Thu, 31 Jan 2008 13:37:32 -0600 (CST)
From:	Bruce Allen <ballen@...vity.phys.uwm.edu>
To:	Bill Fink <billfink@...dspring.com>
cc:	SANGTAE HA <sangtae.ha@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: Re: e1000 full-duplex TCP performance well below wire speed

Hi Bill,

>>> I see similar results on my test systems
>>
>> Thanks for this report and for confirming our observations.  Could you
>> please confirm that a single-port bidrectional UDP link runs at wire
>> speed?  This helps to localize the problem to the TCP stack or interaction
>> of the TCP stack with the e1000 driver and hardware.
>
> Yes, a single-port bidirectional UDP test gets full GigE line rate
> in both directions with no packet loss.

Thanks for confirming this.  And thanks also for nuttcp!  I just 
recognized you as the author.

Cheers,
 	Bruce
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