Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261613AbUJ0DAj (ORCPT ); Tue, 26 Oct 2004 23:00:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261615AbUJ0DAi (ORCPT ); Tue, 26 Oct 2004 23:00:38 -0400 Received: from gate.crashing.org ([63.228.1.57]:41698 "EHLO gate.crashing.org") by vger.kernel.org with ESMTP id S261613AbUJ0DA3 (ORCPT ); Tue, 26 Oct 2004 23:00:29 -0400 Subject: Strange IO behaviour on wakeup from sleep From: Benjamin Herrenschmidt To: Linux Kernel list Cc: Paul Mackerras , Andrew Morton , Bartlomiej Zolnierkiewicz Content-Type: text/plain Date: Wed, 27 Oct 2004 12:56:44 +1000 Message-Id: <1098845804.606.4.camel@gaston> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 955 Lines: 25 Hi ! Not much datas at this point yet, but paulus and I noticed that current bk (happened already last saturday or so) has a very strange problem when waking up from sleep (suspend to ram) on our laptops. This doesn't seem to be directly related to the PM code, at least not the arch one, as far as I know. The IDE throughput goes down to less than 100k/sec on hdparm. We haven't yet figured out where the time is lost, the disk seem to properly be restored to UDMA4 as usual, that code didn't change for ages, I don't think it's a problem at that level in IDE. I'm not sure yet how to track that down, it could be the IO scheduler getting messed up on wakeup for some reason. Any clue appreciated. Ben. - 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/