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Message-ID: <19f34abd0806191325s4c10660dt8da146ad2ef4e63b@mail.gmail.com>
Date: Thu, 19 Jun 2008 22:25:17 +0200
From: "Vegard Nossum" <vegard.nossum@gmail.com>
To: "Robert Hancock" <hancockr@shaw.ca>
Subject: Re: Strange problem with e1000 driver - ping packet loss
Cc: vatsa@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
       e1000-devel@lists.sourceforge.net, varunc@linux.vnet.ibm.com,
       jbarnes@virtuousgeek.org, greg@kroah.com, "Ingo Molnar" <mingo@elte.hu>
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On 6/19/08, Robert Hancock <hancockr@shaw.ca> wrote:
> Srivatsa Vaddagiri wrote:
>
> > Hi,
> >        I happened to look at a system which was exhibiting poor ping
> > performance with e1000 driver (in 2.6.25) and had some questions regarding
> that.
> >
> > Ping test was done between the system and a laptop, which were connected
> > using a straight ethernet cable. Ping reported round trip times running
> > into seconds (!) and also packet loss.
> >
> > Upon some investigation, I found that the interrupt count field in
> > /proc/interrupts (associated with eth1) is not incrementing as fast as
> > it should. Moreover eth1 interrupt line is shared with the hard disk
> > interrupt (ata_piix) as below:

Just FYI, it seems that more people have the same (?) problem:

http://www.ussg.iu.edu/hypermail/linux/kernel/0806.2/0499.html

It might be worth joining forces to fight down the bug once and for
all if it's still not fixed after one and a half years? Sorry, I
really meant error instead of bug.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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