Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 6 Feb 2001 15:50:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 6 Feb 2001 15:50:04 -0500 Received: from ns.virtualhost.dk ([195.184.98.160]:6674 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id ; Tue, 6 Feb 2001 15:49:58 -0500 Date: Tue, 6 Feb 2001 21:49:04 +0100 From: Jens Axboe To: Ben LaHaise Cc: Ingo Molnar , Linus Torvalds , "Stephen C. Tweedie" , Alan Cox , Manfred Spraul , Steve Lord , Linux Kernel List , kiobuf-io-devel@lists.sourceforge.net, Ingo Molnar Subject: Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait Message-ID: <20010206214904.F2975@suse.de> In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ; from bcrl@redhat.com on Tue, Feb 06, 2001 at 03:25:00PM -0500 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 06 2001, Ben LaHaise wrote: > =) This is what I'm seeing: lots of processes waiting with wchan == > __get_request_wait. With async io and a database flushing lots of io > asynchronously spread out across the disk, the NR_REQUESTS limit is hit > very quickly. You can't do async I/O this way! In going what Linus said, make submit_bh return an int telling you if it failed to queue the buffer and use READA/WRITEA to submit it. -- Jens Axboe - 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/