From mboxrd@z Thu Jan 1 00:00:00 1970 From: CaT Subject: Re: intermittant petabyte usage reported with broadcom nic Date: Tue, 17 Apr 2007 09:43:48 +1000 Message-ID: <20070416234348.GF8345@zip.com.au> References: <20070402014319.GA8345@zip.com.au> <20070402001300.3b66007d.akpm@linux-foundation.org> <20070402074108.GB8345@zip.com.au> <1176596401.5847.7.camel@dell> <1176750651.6217.3.camel@dell> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andrew Morton , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Jean-Daniel Pauget To: Michael Chan Return-path: Received: from nessie.weebeastie.net ([220.233.7.36]:1858 "EHLO bunyip.lochness.weebeastie.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1031030AbXDPXmU (ORCPT ); Mon, 16 Apr 2007 19:42:20 -0400 Content-Disposition: inline In-Reply-To: <1176750651.6217.3.camel@dell> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Mon, Apr 16, 2007 at 12:10:51PM -0700, Michael Chan wrote: > On Sat, 2007-04-14 at 17:20 -0700, Michael Chan wrote: > > > I also like Andi's idea of using change_page_attr() to isolate the > > problem. I'll try to send you a debug patch in the next few days to try > > that out. Thanks. > > Here's the debug patch for x86 only that will change the statistics > memory block to read-only. If the kernel is corrupting it, you should > get a page fault that will crash the system. If you continue to see > bogus counters, it is definitely a firmware or hardware problem. Please > try it and let me know. Thanks. Ahh. Would truly love to but the moment you said 'crash the system' I had to bail. These boxes are in production and as such a crash would be, shall we say, unwelcome. I might be able to fenagle something but I very-much doubt it. Perhaps Jean-Daniel, who is also experiencing this problem and seemingly more frequently then I, has a box that he could run your patch on. I think we both run pretty-much the same hardware (Dell [12]950s). I've CCed him. -- "To the extent that we overreact, we proffer the terrorists the greatest tribute." - High Court Judge Michael Kirby