From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: Strange latency spikes/TX network stalls on Sun Fire X4150(x86) and e1000e Date: Mon, 21 May 2012 10:30:05 +0200 Message-ID: <1337589005.3361.19.camel@edumazet-glaptop> References: <668eeb0d42a1678d9083a58deb3ac40d@visp.net.lb> <88c43001441945e1431609db252b69e7@visp.net.lb> <79d6b56fdf5f4be4656079568d5a7445@visp.net.lb> <4775d023592b876909aceb152f94aa01@visp.net.lb> <1337540825.3361.0.camel@edumazet-glaptop> <1337572583.3361.8.camel@edumazet-glaptop> <6d7500e1c3b4b191c0b5a11003b161d6@visp.net.lb> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Tom Herbert , netdev@vger.kernel.org, e1000-devel@lists.sourceforge.net, jeffrey.t.kirsher@intel.com, jesse.brandeburg@intel.com, davem@davemloft.net To: Denys Fedoryshchenko Return-path: Received: from mail-ee0-f46.google.com ([74.125.83.46]:64899 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755719Ab2EUIaL (ORCPT ); Mon, 21 May 2012 04:30:11 -0400 Received: by eeit10 with SMTP id t10so1306819eei.19 for ; Mon, 21 May 2012 01:30:09 -0700 (PDT) In-Reply-To: <6d7500e1c3b4b191c0b5a11003b161d6@visp.net.lb> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 2012-05-21 at 11:06 +0300, Denys Fedoryshchenko wrote: > Not sure it is a lot of time, after all it is 2 x core quad machine, > should be enough fast for pings. > It will cause stalls on small packets even more seems. > > Tested latest git, net-next, still the same, stalls. > hardware latency detector are silent by the way, so there is no > significant SMI. > I am trying to reproduce your problem here with no luck yet. I wonder of softirq are correctly scheduled on your machine