From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Schumacher Subject: Re: new kernel = megaraid performance cut in half Date: Tue, 14 May 2002 01:05:29 -0800 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <3CE0D359.9070800@aptalaska.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Alan, I am running exactly 1g of ram in the machine. Is there a way to apply those patches manually or should I get the kernel-2.4.18-4.i686.rpm from here: http://rhn.redhat.com/errata/RHBA-2002-085.html. Thanks for the quick response. schu Alan Cox wrote: >>running redhat 7.2. I was using the default kernel but I decided to >>upgrade to 2.4.18 to get the new VM code and for some quota fixes. >>Anyway, I compiled the kernel and the machine boots fine but my disk >>speed cut in half. > > > Do you have large amounts of memory ? The Red Hat kernel includes patches > that vastly up performance of DMA capable controllers when more than 1Gb > of RAM is in use. > > Alan