Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936527AbWLARE6 (ORCPT ); Fri, 1 Dec 2006 12:04:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S936528AbWLARE6 (ORCPT ); Fri, 1 Dec 2006 12:04:58 -0500 Received: from nz-out-0506.google.com ([64.233.162.229]:56239 "EHLO nz-out-0102.google.com") by vger.kernel.org with ESMTP id S936527AbWLARE6 (ORCPT ); Fri, 1 Dec 2006 12:04:58 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:mime-version:content-type:content-transfer-encoding:content-disposition; b=pzH6wLHRa2v266DOkqjvf2HkrNsnot21+lYBEKUbJ+fhRCE8T57oZl4SQAkUOBAP3ud+EJo4SC2P7fz5zBHzpx8I/XwlZzfVdALdnuhAZ+wy6PxsBbj9DVogm7d+d2gHWP+5NDufRVyDLiEPYtT534jy21C13VO3KaUxpjtWX6c= Message-ID: <5d96567b0612010904s361b799t8db72accc287ca54@mail.gmail.com> Date: Fri, 1 Dec 2006 19:04:57 +0200 From: "Raz Ben-Jehuda(caro)" To: linux-aio@kvack.org, "Linux Kernel" Subject: slow io_submit Cc: jens.axboe@oracle.com, suparna@in.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 572 Lines: 16 Jens suparna hello I have managed to understand why io_submit is sometimes very slow. It is because the device is plugged once too many io's are being sent. I have conducted a simple test with nr_request to default value of 128 and and 256. and it proved to be correct. I would truely appreciate your comment on this. -- Raz - 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/