Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932856AbYBGSHJ (ORCPT ); Thu, 7 Feb 2008 13:07:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758612AbYBGSG5 (ORCPT ); Thu, 7 Feb 2008 13:06:57 -0500 Received: from ithilien.qualcomm.com ([129.46.51.59]:45454 "EHLO ithilien.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756494AbYBGSG4 (ORCPT ); Thu, 7 Feb 2008 13:06:56 -0500 Message-ID: <47AB48B0.10403@qualcomm.com> Date: Thu, 07 Feb 2008 10:06:40 -0800 From: Max Krasnyansky User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: "Kok, Auke" CC: Pavel Machek , e1000-devel@lists.sourceforge.net, jesse.brandeburg@intel.com, kernel list , john.ronciak@intel.com, jeffrey.t.kirsher@intel.com Subject: Re: [E1000-devel] e1000 1sec latency problem References: <20080207141718.GA2030@elf.ucw.cz> <47AB38AB.8050001@qualcomm.com> <47AB3EEF.6050005@intel.com> In-Reply-To: <47AB3EEF.6050005@intel.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1047 Lines: 22 Kok, Auke wrote: > Max Krasnyansky wrote: >> So you don't think it's related to the interrupt coalescing by any chance ? >> I'd suggest to try and disable the coalescing and see if it makes any difference. >> We've had lots of issues with coalescing misbehavior. Not this bad (ie 1 second) though. >> >> Add this to modprobe.conf and reload e1000 module >> >> options e1000 RxIntDelay=0,0 RxAbsIntDelay=0,0 InterruptThrottleRate=0,0 TxIntDelay=0,0 TxAbsIntDelay=0,0 > > that can't be the problem. irq moderation would only account for 2-3ms variance > maximum. Oh, I've definitely seen worse than that. Not as bad as a 1second though. Plus you're talking about the case when coalescing logic is working as designed ;-). What if there is some kind of bug where timer did not expire or something. Max -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/