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

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Message-Id: <20080131123627.599be68f.billfink@mindspring.com>
Date:	Thu, 31 Jan 2008 12:36:27 -0500
From:	Bill Fink <billfink@...dspring.com>
To:	Bruce Allen <ballen@...vity.phys.uwm.edu>
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 Bruce,

On Thu, 31 Jan 2008, Bruce Allen wrote:

> > 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.

[bill@...nce4 ~]$ nuttcp -f-beta -Itx -u -Ru -w2m 192.168.6.79 & nuttcp -f-beta -Irx -r -u -Ru -w2m 192.168.6.79
tx:  1187.0078 MB /  10.04 sec =  992.0550 Mbps 19 %TX 7 %RX 0 / 151937 drop/pkt 0.00 %loss
rx:  1187.1016 MB /  10.03 sec =  992.3408 Mbps 19 %TX 7 %RX 0 / 151949 drop/pkt 0.00 %loss

						-Bill
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