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 01:48:43 -0800 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <3CE0DD7B.9090201@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, FYI, [root@mail_test root]# uname -a Linux mail_test 2.4.18-4smp #1 SMP Thu May 2 18:32:34 EDT 2002 i686 unknown [root@mail_test root]# hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 64 MB in 1.22 seconds = 52.46 MB/sec [root@mail_test root]# hdparm -t /dev/sda So the redhat 2.4.18 kernel reads disk almost 2.5 times better on my system.... sounds like something that would be handy in a stable kernel release. Thanks for you help, schu Alan Cox wrote: >>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. > > > Your best bet is probably to grab the RH errata kernel. If you get the > source rpm that also includes the patches for some controllers to do > I/O from all of memory. > > Hopefully that restores the speed