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From: Jesper Krogh <jesper@krogh.cc>
To: David Miller <davem@davemloft.net>
Cc: Matheos.Worku@Sun.COM, yhlu.kernel@gmail.com,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
Date: Thu, 22 May 2008 18:32:07 +0200	[thread overview]
Message-ID: <4835A007.7020601@krogh.cc> (raw)
In-Reply-To: <20080509.154538.28321777.davem@davemloft.net>

David Miller wrote:
> From: Matheos Worku <Matheos.Worku@Sun.COM>
> Date: Fri, 09 May 2008 15:36:17 -0700
> 
>> I have observed TX throughput degradation (and increased CPU 
>> utilization)  occurs with increased # of connections, when CPU count > 4 
>> CPUs.  I don't think it is related to the driver (or HW).
> 
> All transmits through a device are fully serialized currently,
> it's a known problem and something we plan to fix.

I google'd up this one:

http://vger.kernel.org/~davem/davem_tokyo08.pdf (slide 23+).

Does this mean that I can expect every 10G card to have this limitation
under Linux? Or are some known to be better than others?
(I can probably justify paying for another 10G card if I can expect to
gain the last 400MB/s).

Since I cannot push more than ~600MB/s through the NIC before a single 
cpu is bottlenecked, it seem most likely to be this TX throughput
thing I hit.

Thanks

Jesper
-- 
Jesper

  reply	other threads:[~2008-05-22 16:32 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <4821F3B7.2090702@krogh.cc>
     [not found] ` <86802c440805071130m62c1f4edydb3316dac4a2aba2@mail.gmail.com>
2008-05-07 21:15   ` NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24) David Miller
2008-05-09 18:32     ` Jesper Krogh
2008-05-09 21:32       ` David Miller
2008-05-09 21:59         ` Jesper Krogh
2008-05-09 22:07           ` David Miller
2008-05-09 22:13             ` Jesper Krogh
2008-05-09 22:09           ` Matheos Worku
2008-05-09 22:15             ` Jesper Krogh
2008-05-09 22:36               ` Matheos Worku
2008-05-09 22:43                 ` Matheos Worku
2008-05-09 22:46                   ` David Miller
2008-05-09 23:10                   ` Jesper Krogh
2008-05-09 23:21                     ` Matheos Worku
2008-05-09 22:45                 ` David Miller
2008-05-22 16:32                   ` Jesper Krogh [this message]
2008-05-22 17:15                     ` Ben Hutchings
2008-05-22 17:41                     ` David Miller
2008-05-22 18:14                       ` Ben Hutchings
2008-05-22 18:28                         ` David Miller
2008-06-01  7:25                       ` Andrey Panin
2008-06-01 16:01                         ` David Miller
2008-05-09 22:20           ` Rick Jones
2008-05-09 22:48             ` Jesper Krogh
2008-05-09 23:03               ` Rick Jones
2008-05-09 23:13                 ` Jesper Krogh
2008-05-09 23:33                   ` Rick Jones
2008-05-09 23:08               ` David Dillow
2008-05-10  6:22                 ` Jesper Krogh
2008-05-10 15:53                   ` Roland Dreier
2008-05-12  6:49                     ` Jesper Krogh
2008-05-10  2:20               ` Bill Fink
2008-05-10 11:01       ` Jesper Krogh
2008-05-11  4:34         ` David Miller
2008-05-11  5:44           ` Jesper Krogh
2008-05-11  6:08             ` David Miller
2008-05-11  9:47               ` Jesper Krogh
2008-05-12  6:52           ` Jesper Krogh
2008-05-26 19:03             ` Jesper Krogh
2008-05-26 19:33               ` David Miller
2008-05-26 19:39                 ` David Miller
2008-05-26 20:54                   ` Jesper Krogh
2008-05-26 22:15                     ` David Miller
2008-05-26 22:21                       ` Jesper Krogh
2008-05-26 22:30                         ` David Miller
2008-05-27  6:19                       ` Jesper Krogh
2008-05-28  1:18                         ` Matheos Worku
2008-05-29  5:34                           ` David Miller
2008-05-30  0:14                             ` Matheos Worku
2008-05-30  7:00                               ` David Miller
2008-06-16 18:09                                 ` Matheos Worku
2008-06-16 18:21                                   ` Jesper Krogh
2008-06-18  0:02                           ` David Miller

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