From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760386AbYEJAA3 (ORCPT ); Fri, 9 May 2008 20:00:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757196AbYEJAAO (ORCPT ); Fri, 9 May 2008 20:00:14 -0400 Received: from emroute3.ornl.gov ([160.91.4.110]:39830 "EHLO emroute3.ornl.gov" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756723AbYEJAAN (ORCPT ); Fri, 9 May 2008 20:00:13 -0400 X-Greylist: delayed 3085 seconds by postgrey-1.27 at vger.kernel.org; Fri, 09 May 2008 20:00:12 EDT Date: Fri, 09 May 2008 19:08:45 -0400 From: David Dillow Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24) In-reply-to: <4824D4C0.10201@krogh.cc> To: Jesper Krogh Cc: Rick Jones , David Miller , yhlu.kernel@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Message-id: <1210374525.21330.6.camel@lap75545.ornl.gov> Organization: Oak Ridge National Laboratory MIME-version: 1.0 X-Mailer: Evolution 2.12.3 (2.12.3-4.fc8) Content-type: text/plain Content-transfer-encoding: 7bit References: <86802c440805071130m62c1f4edydb3316dac4a2aba2@mail.gmail.com> <20080507.141521.193714938.davem@davemloft.net> <482498D5.9060008@krogh.cc> <20080509.143229.174354251.davem@davemloft.net> <4824C936.9000103@krogh.cc> <4824CE43.8060203@hp.com> <4824D4C0.10201@krogh.cc> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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