From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Russell Coker Subject: Re: [linux-lvm] Apparent performance degradation for each PV with striping Date: Thu, 22 Mar 2001 09:55:44 +0100 References: <3AB59501.FF6ED9F3@dataventures.com> <20010318232012.A1169@omnifarious.mn.org> In-Reply-To: <20010318232012.A1169@omnifarious.mn.org> MIME-Version: 1.0 Message-Id: <0103220955440M.00851@lyta> Content-Transfer-Encoding: quoted-printable Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@sistina.com, "Eric M. Hopper" On Monday 19 March 2001 06:20, Eric M. Hopper wrote: > =09Have you played with hdparm to try to tune the way the kernel > talks to your IDE drives? > > =09That may be the reason for being CPU bound. The kernel tends to > default to the slowest possible method because there are a lot of bad > IDE controllers and drives out there that will trash your data if you > try to talk to them in a way they aren't expecting. > > Have fun (if at all possible), The 2.4.x kernels will turn on DMA and multi-mode at boot time if you cho= ose=20 the appropriate options in the kernel config. I generally compile my ker= nels=20 that way so they use the available features in the hardware without the n= eed=20 to bother with hdparm. --=20 http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page