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| Getting bad performance from new HD http://forum.linhes.org/viewtopic.php?f=2&t=3115 |
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| Author: | ceenvee703 [ Thu Dec 23, 2004 12:24 pm ] |
| Post subject: | Getting bad performance from new HD |
OK, got a 200GB Seagate drive to add to my master backend. Decided to go the LVM route with it so I could add it to my /dev/hda4 partition's 130GB or so of space. I haven't even gotten to that point yet because my read performance is obviously not good... playback of recordings is stuttering, not badly but definitely noticeable. I followed the LVM HOWTO on the wiki: http://knoppmythwiki.homelinux.org/inde ... e=LvmHowTo I also figured I would need to turn on DMA on the new drive so I edited /etc/init.d/bootmisc.sh to turn DMA and other stuff on with /dev/hdb according to the optimizing HD article on the wiki and a LinuxDevCenter article: http://knoppmythwiki.homelinux.org/inde ... erformance http://www.linuxdevcenter.com/pub/a/lin ... dparm.html I've played with a bunch of settings combination for hdparm in bootmisc.sh but none of them are staying after a reboot. Doing hdparm /dev/hdb after a reboot I get: Code: root@mythtv:/home/mythtv# hdparm /dev/hdb /dev/hdb: multcount = 0 (off) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 24321/255/63, sectors = 390721968, start = 0 I get good buffer-cache reads but lousy buffered disk reads from hdb: Code: root@mythtv:/home/mythtv# hdparm -tT /dev/hdb /dev/hdb: Timing buffer-cache reads: 128 MB in 0.36 seconds =355.56 MB/sec Timing buffered disk reads: 64 MB in 26.36 seconds = 2.43 MB/sec The relevant part of my /etc/init.d/bootmisc.sh currently reads: Code: # enable DMA
/sbin/hdparm -d1 /dev/hda /sbin/hdparm -d1 -c1 -u1 /dev/hdc /sbin/hdparm -X66 -d1 -u1 -m16 -c3 /dev/hdb # Still playing but any assistance would be appreciated, especially on how to get DMA to stay on for my drives. Thanks. |
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| Author: | Xsecrets [ Thu Dec 23, 2004 12:45 pm ] |
| Post subject: | |
well couple of things 1) have you tried running hdparm from a command line after booting to see if you get any messages? 2) I would drop the -x66 switch as you are probably using a dma100 or better drive, and it will do nothing but slow you down, and the -c switch is a toggle switch for 32bit I/O so it can only be 0 or 1 3 is not a valid argument. |
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| Author: | ceenvee703 [ Thu Dec 23, 2004 2:15 pm ] |
| Post subject: | |
Thanks for the hints on the different settings. If I run hdparm from the command line I can turn DMA on just fine. It's turning it on at startup that isn't working with the edits to bootmisc.sh. |
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