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From: Carsten Aulbert <carsten.aulbert@aei.mpg.de>
To: Andi Kleen <andi@firstfloor.org>
Cc: Bruce Allen <ballen@gravity.phys.uwm.edu>,
	"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
	netdev@vger.kernel.org,
	Henning Fehrmann <henning.fehrmann@aei.mpg.de>,
	Bruce Allen <bruce.allen@aei.mpg.de>
Subject: Re: e1000 full-duplex TCP performance well below wire speed
Date: Thu, 31 Jan 2008 17:09:57 +0100	[thread overview]
Message-ID: <47A1F2D5.5070709@aei.mpg.de> (raw)
In-Reply-To: <p738x265p7p.fsf@bingen.suse.de>

Hi Andi,

Andi Kleen wrote:
> 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.

I just tried that:

https://n0.aei.uni-hannover.de/wiki/index.php/NetworkTestNetperf3

It seems that the numbers do get better (sweet-spot seems to be MTU6000 
with 914 MBit/s and 927 MBit/s), however for other settings the results 
vary a lot so I'm not sure how large the statistical fluctuations are.

Next test I'll try if it makes sense to enlarge the ring buffers.

Thanks

Carsten

  parent reply	other threads:[~2008-01-31 16:10 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-30 12:23 e1000 full-duplex TCP performance well below wire speed Bruce Allen
2008-01-30 17:36 ` Brandeburg, Jesse
2008-01-30 18:45   ` Rick Jones
2008-01-30 23:15     ` Bruce Allen
2008-01-31 11:35     ` Carsten Aulbert
2008-01-31 17:55       ` Rick Jones
2008-02-01 19:57         ` Carsten Aulbert
2008-01-30 23:07   ` Bruce Allen
2008-01-31  5:43     ` Brandeburg, Jesse
2008-01-31  8:31       ` Bruce Allen
2008-01-31 18:08         ` Kok, Auke
2008-01-31 18:38           ` Rick Jones
2008-01-31 18:47             ` Kok, Auke
2008-01-31 19:07               ` Rick Jones
2008-01-31 19:13           ` Bruce Allen
2008-01-31 19:32             ` Kok, Auke
2008-01-31 19:48               ` Bruce Allen
2008-02-01  6:27                 ` Bill Fink
2008-02-01  7:54                   ` Bruce Allen
2008-01-31 15:12       ` Carsten Aulbert
2008-01-31 17:20         ` Brandeburg, Jesse
2008-01-31 17:27           ` Carsten Aulbert
2008-01-31 17:33             ` Brandeburg, Jesse
2008-01-31 18:11             ` running aggregate netperf TCP_RR " Rick Jones
2008-01-31 18:03         ` Rick Jones
2008-01-31 15:18       ` Carsten Aulbert
2008-01-31  9:17     ` Andi Kleen
2008-01-31  9:59       ` Bruce Allen
2008-01-31 16:09       ` Carsten Aulbert [this message]
2008-01-31 18:15         ` Kok, Auke
2008-01-30 19:17 ` Ben Greear
2008-01-30 22:33   ` Bruce Allen
  -- strict thread matches above, loose matches on Subject: below --
2008-01-30  9:51 Bruce Allen
2008-01-30 13:18 ` Andi Kleen
2008-01-30 13:38   ` Bruce Allen
2008-01-30 14:08     ` David Miller
2008-01-30 13:53 ` David Miller
2008-01-30 14:01   ` Bruce Allen
2008-01-30 16:21     ` Stephen Hemminger
2008-01-30 16:21       ` Stephen Hemminger
2008-01-30 22:25       ` Bruce Allen
2008-01-30 22:33         ` Stephen Hemminger
2008-01-30 23:23           ` Bruce Allen
2008-01-31  0:17         ` SANGTAE HA
2008-01-31  8:52           ` Bruce Allen
2008-01-31 11:45           ` Bill Fink
2008-01-31 14:50             ` David Acker
2008-01-31 15:57               ` Bruce Allen
2008-01-31 15:54             ` Bruce Allen
2008-01-31 17:36               ` Bill Fink
2008-01-31 19:37                 ` Bruce Allen
2008-01-31 18:26             ` Brandeburg, Jesse

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