From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frank Reppin Subject: Re: [PATCH net] e1000e: Change wthresh to 1 to avoid possible Tx stalls. Date: Wed, 10 Oct 2012 03:25:54 +0200 Message-ID: <5074CEA2.6010504@undermydesk.org> References: <20120606174355.823e9aa7.shimoda.hiroaki@gmail.com> <1339030752.2075.1.camel@jtkirshe-mobl> <1339043085.26966.77.camel@edumazet-glaptop> <1339044752.2075.14.camel@jtkirshe-mobl> <1349762863.21172.3848.camel@edumazet-glaptop> <20121009103629.0000569a@unknown> <5074A9CA.50308@tomt.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, Jeff Kirsher , e1000-devel@lists.sourceforge.net To: Jesse Brandeburg Return-path: Received: from amazone.undermydesk.org ([213.211.198.100]:47834 "EHLO amazone.undermydesk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757274Ab2JJBcv (ORCPT ); Tue, 9 Oct 2012 21:32:51 -0400 In-Reply-To: <5074A9CA.50308@tomt.net> Sender: netdev-owner@vger.kernel.org List-ID: On 10.10.2012 00:48, Andre Tomt wrote: > On 09. okt. 2012 19:36, Jesse Brandeburg wrote: [...] >> Hints or clues (I'm trying to follow the repro steps mentioned in >> some related threads) are appreciated. In our scenario - the SuperMicro X8SIE-LN4 acts as a router. eth0 -> uplink eth1 -> core servers network 192.168.a.b/24 eth2 -> developer employees network 192.168.c.d/24 eth1 and eth2 are hooked into (two different) HP2510-24G switches (they both show no errors at all). The switch connected to eth2 connects a bunch of developers doing day-2-day stuff (commits/checkouts/documentation/ listening to stream music/surfing/email) and the such. Continously running a ping from ie. 192.168.c.d/24 to 192.168.a.b/24 visualizes those spikes (mostly triplets, where the first echo reply is quite high and the two following replies are each around 50 percent faster - but mostly still >500ms) - whenever these spikes happen, it feels like the whole net 'stalls'. Just like Denys Fedoryshchenko stated in http://www.mail-archive.com/e1000-devel@lists.sourceforge.net/msg05517.html HTH, Frank Reppin -- 43rd Law of Computing: Anything that can go wr fortune: Segmentation violation -- Core dumped