From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 29 Oct 2000 13:28:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 29 Oct 2000 13:27:51 -0500 Received: from lolita.speakeasy.net ([216.254.0.13]:21320 "HELO lolita.speakeasy.net") by vger.kernel.org with SMTP id ; Sun, 29 Oct 2000 13:27:42 -0500 Message-ID: <39FC78BF.90607@speakeasy.org> Date: Sun, 29 Oct 2000 11:21:35 -0800 From: Miles Lane User-Agent: Mozilla/5.0 (X11; U; Linux 2.4.0-test10 i686; en-US; m18) Gecko/20001025 X-Accept-Language: en MIME-Version: 1.0 To: Jens Axboe CC: Rui Sousa , Rik van Riel , linux-kernel@vger.kernel.org Subject: Re: Blocked processes <=> Elevator starvation? In-Reply-To: <20001027134603.A513@suse.de> <20001027202710.A825@suse.de> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe wrote: > On Sat, Oct 28 2000, Rui Sousa wrote: > >> After adding >> >> #define ELEVATOR_HOLE_MERGE 3 >> >> to linux/include/linux/elevator.h it compiled ok. > > > Oops sorry, I'm on the road so the patch was extracted > from my packet writing tree (and not my regular tree). > > >> There were still some stalls but they only lasted a couple of >> seconds. The patch did make a difference and for the better. > > > Ok, still needs a bit of work. Thanks for the feedback. Have you resolved this problem completely, now? I am testing the USB Storage support with my ORB backup drive. When I run: dd if=/dev/zero of=/dev/sda bs=1k count=2G The drive gets data quickly for about thirty seconds. Then the throughput drops off to about ten percent of its previous transfer rate. This dropoff appears to be due to conflict over accessing filesystems. Specifically, I have USB_STORAGE_DEBUG enabled, which shoots a ton of debugging output into my kernel log. When the throughput to the ORB drive falls off, all writing to the syslog ceases. At least, that's what "tail -f" shows. I would be happy to test any patches you have for this problem. I hope this helps, Miles - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/