From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jay Strauss Subject: Re: Raid 1 install revealed poor HD performance (I think) Date: Thu, 19 May 2005 10:32:43 -0500 Message-ID: <428CB19B.8010402@heyjay.com> References: <428A09A3.9000802@heyjay.com> <428A81FB.1070201@home.se> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <428A81FB.1070201@home.se> Sender: linux-raid-owner@vger.kernel.org To: Henrik Holst Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi (again): I diff'ed the contents of /proc/ide of Knoppix and Sarge, there were a couple of (possibly) interesting differences. I'm not sure how to go about changing the settings. The net/net is on my controller under knoppix it says UDMA Enabled but on Sarge it's disabled. Also the writecache is enabled under knoppix (I did a hdparm -W 1 /dev/hda, but my tests were identical) Below are the diffs, I'd like to make the sarge install setting identical, and see if that changes anything. If anyone knows how to alter these settings, I'd be appreciated thanks Jay jstrauss@hydrogen:~$ diff -r sarge.ide/sis knoppix.ide/sis 10,11c10,11 < UDMA Enabled UDMA Enabled < UDMA Cycle Time 2 CLK UDMA Cycle Time 4 CLK --- > UDMA Disabled UDMA Disabled > UDMA Cycle Time Reserved UDMA Cycle Time Reserved and jstrauss@hydrogen:~$ diff sarge.ide/hda/settings knoppix.ide/hda/settings 7a8 > breada_readahead 8 0 255 rw 9c10 < current_speed 68 0 70 rw --- > current_speed 12 0 70 rw 11c12,13 < init_speed 68 0 70 rw --- > file_readahead 124 0 16384 rw > init_speed 12 0 70 rw 16c18,19 < multcount 0 0 16 rw --- > max_kb_per_request 128 1 255 rw > multcount 16 0 16 rw 20a24 > slow 0 0 1 rw 23c27 < wcache 1 0 1 rw --- > wcache 0 0 1 rw