linux-kernel - Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

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Message-id: <1210374525.21330.6.camel@lap75545.ornl.gov>
Date:	Fri, 09 May 2008 19:08:45 -0400
From:	David Dillow <dillowda@...l.gov>
To:	Jesper Krogh <jesper@...gh.cc>
Cc:	Rick Jones <rick.jones2@...com>,
	David Miller <davem@...emloft.net>, yhlu.kernel@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)


On Sat, 2008-05-10 at 00:48 +0200, Jesper Krogh wrote:
> Rick Jones wrote:
> >> The number of contextswitches seems enourmous.. over 120.000 sometimes.
> >> When transmitting around the same amount of data (4xgigabit bonded with
> >> 802.3ad) 4x110MB/s the amount of contextswitches only reaches 3-4.000. I
> >> have no idea if this has any relevance.
> >>
> >> Should this setup not be able to fill the pipe?
> > 
> > Into which slot was the Neptune inserted?  (sure will be nice to have 
> > Alex Chiang's pci slot id patch in mainline one of these days :)
> > 
> > Is that slot x4, x8, x16?
> 
> I can find out excactly .. on monday. But shouldn't x4 be enough anyway?
> wikipedia says 250MB/s pr. lane. And no slots is less than x4, so I
> thought that it didn't matter to me.

lspci -vvv on the slot can tell you what has been negotiated. Also, you
can figure the effective PCIe bandwidth using ~200 MB/s as a rule of
thumb, given the various overheads on the bus. So an x4 won't fully load
up a 10Gbps link.

At least, that's what we're seeing in x8 slots using Infiniband cards,
so your mileage may vary.
-- 
Dave Dillow
National Center for Computational Science
Oak Ridge National Laboratory
(865) 241-6602 office


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