Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1945946AbWLVFjF (ORCPT ); Fri, 22 Dec 2006 00:39:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1945932AbWLVFjF (ORCPT ); Fri, 22 Dec 2006 00:39:05 -0500 Received: from wx-out-0506.google.com ([66.249.82.238]:53609 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1945946AbWLVFjE (ORCPT ); Fri, 22 Dec 2006 00:39:04 -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=qdPwxqb+G1y43fwnlptM7P8bSyWrI3MKOYGqd7m2nsA9VTxnr9ynioB8VUwURrffh1xUH+TbLMCoKH8y/Oo2o053fqbsjo9E86mxwezGjbJ/XUOD13ZmpPylXPj59JuGGWgnT9+YzIhgzIlXKZ+tA2P6wVtat45dlr6TJrM7knE= Message-ID: <652016d30612212139l40c6163djf79db8a68b6eb334@mail.gmail.com> Date: Fri, 22 Dec 2006 11:24:03 +0545 From: "Manish Regmi" To: "Erik Mouw" Subject: Re: Linux disk performance. Cc: kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org In-Reply-To: <20061221132241.GA15226@gateway.home> 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> <4589B92F.2030006@tmr.com> <652016d30612202203h16331f96o2147872db3cb2d43@mail.gmail.com> <20061221132241.GA15226@gateway.home> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1491 Lines: 41 On 12/21/06, Erik Mouw wrote: > Bursty video traffic is really an application that could take advantage > from the kernel buffering. Unless you want to reinvent the wheel and do > the buffering yourself (it is possible though, I've done it on IRIX). But in my test O_DIRECT gave a slight better performance. Also the CPU usage decreased. > > BTW, why are you so keen on smooth-at-the-microlevel writeout? With > real time video applications it's only important not to drop frames. > How fast those frames will go to the disk isn't really an issue, as > long as you don't overflow the intermediate buffer. Actually i dont require smooth-at-the-microlevel writeout but the timing bumps are overflowing the intermediate buffers . I was just wondering if i could decrease the 20ms bumps to 3 ms as in other writes. > > Erik > > -- > They're all fools. Don't worry. Darwin may be slow, but he'll > eventually get them. -- Matthew Lammers in alt.sysadmin.recovery > -- --------------------------------------------------------------- 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/