Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1945951AbWLVF4t (ORCPT ); Fri, 22 Dec 2006 00:56:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1945953AbWLVF4t (ORCPT ); Fri, 22 Dec 2006 00:56:49 -0500 Received: from wx-out-0506.google.com ([66.249.82.235]:61241 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1945951AbWLVF4s (ORCPT ); Fri, 22 Dec 2006 00:56:48 -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=A82Wy2CiSGvjgN8MOx73oH8U7pOIdVvhcUp2QgZWlKVM/aa6djg8uH9Ebon/ZiVqaSNRj9d/wIvIXc/DqoIJI59QZNWr4eW4GsMzPuPlebqUOy3AJv8+TWl5EQc+9zspxrITAl4tfAtDxn8ohH4gSx9mf50j4YY/l+wAZZSX3Ek= Message-ID: <652016d30612212156g604d0d15y7fbd27c01e2aab1e@mail.gmail.com> Date: Fri, 22 Dec 2006 11:41:47 +0545 From: "Manish Regmi" To: "Bhanu Kalyan Chetlapalli" Subject: Re: Linux disk performance. Cc: kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org In-Reply-To: <7d15175e0612212139p4fc2fd27x7acb3473701b2c35@mail.gmail.com> 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> <652016d30612200317i6d33d097xe55971750e83cd97@mail.gmail.com> <7d15175e0612211614y3ce090fcn38cbcaced76b1024@mail.gmail.com> <652016d30612212130v433b4e70uc2148278c7ee7198@mail.gmail.com> <7d15175e0612212139p4fc2fd27x7acb3473701b2c35@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1389 Lines: 43 On 12/22/06, Bhanu Kalyan Chetlapalli wrote: > > > > Thanks for the suggestion but the performance was terrible when write > > cache was disabled. > > Performance degradation is expected. But the point is - did the > anomaly, that you have pointed out, go away? Because if it did, then > it is the disk cache which is causing the issue, and you will have to > live with it. Else you will have to look elsewhere. oops, sorry for incomplete answer. Actually i did not tested thoroughly but my initial tests showed some bumps and serious performance degradation. But anyway there was still some bumps... :( (sequence)(channel)(write time in microseconds) 0 0 6366 0 1 9949 0 2 10125 0 3 10165 0 4 11043 0 5 10129 0 6 10089 0 7 10165 0 8 71572 0 9 9882 0 10 8105 0 11 10085 -- --------------------------------------------------------------- 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/