Messages in this thread | | | From | "Gordon Larsen" <> | Subject | Disk speed differences under 2.6.0 | Date | Fri, 1 Aug 2003 07:54:26 -0600 |
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My apologies if this has already been discussed - but has anyone noticed disk I/O speed differences under 2.6.0 as compared to 2.4.20? My system has an ASUS A7V333 MB with 768M Ram, a 1300MHz Duron, three 40GB Maxtor drives running linux software raid. See the screen capture below:
----------------------------- 2.4.20-19.9 ----------------------------------------------- [root@alpha root]# uname -a Linux alpha 2.4.20-19.9 #1 Mon Jul 28 18:59:34 MDT 2003 i686 athlon i386 GNU/Linux [root@alpha root]# hdparm -t /dev/md0
/dev/md0: Timing buffered disk reads: 64 MB in 2.90 seconds = 22.07 MB/sec [root@alpha root]# hdparm -t /dev/md1
/dev/md1: Timing buffered disk reads: 64 MB in 1.66 seconds = 38.55 MB/sec [root@alpha root]# hdparm -t /dev/md2
/dev/md2: Timing buffered disk reads: 64 MB in 0.96 seconds = 66.67 MB/sec [root@alpha root]# hdparm -t /dev/md3
/dev/md3: Timing buffered disk reads: 64 MB in 1.74 seconds = 36.78 MB/sec [root@alpha root]# hdparm -t /dev/md4
/dev/md4: Timing buffered disk reads: 64 MB in 1.74 seconds = 36.78 MB/sec [root@alpha root]# hdparm -t /dev/md5
/dev/md5: Timing buffered disk reads: 64 MB in 1.68 seconds = 38.10 MB/sec [root@alpha root]# hdparm -t /dev/md6
/dev/md6: Timing buffered disk reads: 64 MB in 1.70 seconds = 37.65 MB/sec
----------------------------- 2.6.0-0.test.2.1.28 -----------------------------------------------
[root@alpha root]# uname -a Linux alpha 2.6.0-0.test2.1.28custom #1 Thu Jul 31 20:02:20 MDT 2003 i686 athlon i386 GNU/Linux [root@alpha root]# hdparm -t /dev/md0
/dev/md0: Timing buffered disk reads: 64 MB in 2.67 seconds = 24.00 MB/sec [root@alpha root]# hdparm -t /dev/md1
/dev/md1: Timing buffered disk reads: 64 MB in 1.92 seconds = 33.37 MB/sec [root@alpha root]# hdparm -t /dev/md2
/dev/md2: Timing buffered disk reads: 64 MB in 1.37 seconds = 46.79 MB/sec [root@alpha root]# hdparm -t /dev/md3
/dev/md3: Timing buffered disk reads: 64 MB in 2.23 seconds = 28.69 MB/sec [root@alpha root]# hdparm -t /dev/md4
/dev/md4: Timing buffered disk reads: 64 MB in 2.20 seconds = 29.07 MB/sec [root@alpha root]# hdparm -t /dev/md5
/dev/md5: Timing buffered disk reads: 64 MB in 2.03 seconds = 31.45 MB/sec [root@alpha root]# hdparm -t /dev/md6
/dev/md6: Timing buffered disk reads: 64 MB in 1.99 seconds = 32.23 MB/sec
----------------------------- Mounts -----------------------------------------------
[root@alpha root]# mount /dev/md0 on / type ext3 (rw) none on /proc type proc (rw) usbdevfs on /proc/bus/usb type usbdevfs (rw) /dev/md1 on /boot type ext3 (rw) none on /dev/pts type devpts (rw,gid=5,mode=620) /dev/md3 on /home type ext3 (rw) none on /dev/shm type tmpfs (rw) /dev/md6 on /tmp type ext3 (rw) /dev/md4 on /usr type ext3 (rw) /dev/md5 on /var type ext3 (rw)
----------------------------- MD Device dump -----------------------------------------------
[root@alpha root]# lsraid -R -p # md device [dev 9, 2] /dev/md2 queried online raiddev /dev/md2 raid-level 0 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde1 raid-disk 0 device /dev/hdg2 raid-disk 1
# md device [dev 9, 1] /dev/md1 queried online raiddev /dev/md1 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde2 raid-disk 0 device /dev/hdg1 raid-disk 1
# md device [dev 9, 4] /dev/md4 queried online raiddev /dev/md4 raid-level 5 nr-raid-disks 3 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde3 raid-disk 0 device /dev/hdg3 raid-disk 1 device /dev/hdh3 raid-disk 2
# md device [dev 9, 3] /dev/md3 queried online raiddev /dev/md3 raid-level 5 nr-raid-disks 3 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde5 raid-disk 0 device /dev/hdg5 raid-disk 1 device /dev/hdh5 raid-disk 2
# md device [dev 9, 5] /dev/md5 queried online raiddev /dev/md5 raid-level 5 nr-raid-disks 3 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde6 raid-disk 0 device /dev/hdg6 raid-disk 1 device /dev/hdh6 raid-disk 2
# md device [dev 9, 0] /dev/md0 queried online raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde7 raid-disk 0 device /dev/hdg7 raid-disk 1
# md device [dev 9, 6] /dev/md6 queried online raiddev /dev/md6 raid-level 5 nr-raid-disks 3 nr-spare-disks 0 persistent-superblock 1 chunk-size 64
device /dev/hde8 raid-disk 0 device /dev/hdg8 raid-disk 1 device /dev/hdh8 raid-disk 2
[root@alpha root]#
-------------------------------- end-of-capture -----------------------------------------------
Cheers...Gord
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