Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964996AbWLTLRk (ORCPT ); Wed, 20 Dec 2006 06:17:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964998AbWLTLRk (ORCPT ); Wed, 20 Dec 2006 06:17:40 -0500 Received: from wx-out-0506.google.com ([66.249.82.225]:19060 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964996AbWLTLRj (ORCPT ); Wed, 20 Dec 2006 06:17:39 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=ZMkExjHaFUE2GoxQnNiM5cOzFvgZKRX8HFQxL49/DGF7ZrQkYRGwQIWTnEMOtGLL7DYs2AiJSqL9B6X1nhq77wtiCi2Men0kdLfC4E5GuXr7GUKEWRkNT9u78ClGs+2EIuX7Gl63Iu9moFFZJyZRv8ig6LKfWMBcEcaUISAdedQ= Message-ID: <652016d30612200317i6d33d097xe55971750e83cd97@mail.gmail.com> Date: Wed, 20 Dec 2006 17:02:38 +0545 From: "Manish Regmi" To: "Nick Piggin" Subject: Re: Linux disk performance. Cc: kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org In-Reply-To: <458788D7.2070107@yahoo.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <652016d30612172007m58d7a828q378863121ebdc535@mail.gmail.com> <1166431020.3365.931.camel@laptopd505.fenrus.org> <652016d30612180439y6cd12089l115e4ef6ce2e59fe@mail.gmail.com> <20061218130702.GA14984@gateway.home> <652016d30612182222h7fde4ea5jbc0927c8ebeae76a@mail.gmail.com> <458788D7.2070107@yahoo.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1091 Lines: 31 On 12/19/06, Nick Piggin wrote: > When you submit a request to an empty block device queue, it can > get "plugged" for a number of timer ticks before any IO is actually > started. This is done for efficiency reasons and is independent of > the IO scheduler used. > Thanks for the information.. > Use the noop IO scheduler, as well as the attached patch, and let's > see what your numbers look like. > Unfortunately i got the same results even after applying your patch. I also tried putting q->unplug_delay = 1; But it did not work. The result was similar. -- --------------------------------------------------------------- regards Manish Regmi --------------------------------------------------------------- UNIX without a C Compiler is like eating Spaghetti with your mouth sewn shut. It just doesn't make sense. - 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/