https://bugzilla.novell.com/show_bug.cgi?id=266903 Summary: Suse 10.2 i/o on reiserfs significantly slower than 10.0 Product: openSUSE 10.2 Version: Final Platform: i686 OS/Version: openSUSE 10.2 Status: NEW Severity: Major Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: bagpussnz@gmail.com QAContact: qa@suse.de We have seen that the disk performance on Suse 10.2 is significantly slower than that of Suse 10.0. I originally saw this on a server (scsi disks), but have since been able to reproduce it on a standard PC (3.0Ghz, 1Gb RAM, 160GB SATA disk). To do this, I installed both 10.2 and 10.0 on the PC (dual boot). Both were installed using the defaults (in runlevel 5). Both were formatted as reiser filesystems. For the tests below, I made sure beagle was not running. ------------------------------------------------- Suse 10.0 uname -a gave, Linux linux100 2.6.13-15-smp #1 SMP Tue Sep 13 14:56:15 UTC 2005 i686 i686 i386 GNU/Linux Suse 10.2 uname -a gave, Linux linux102 2.6.18.2-34-default #1 SMP Mon Nov 27 11:46:27 UTC 2006 i686 i686 i386 GNU/Linux ------------------------------------------------- Suse 10.0 hdparm -t -T /dev/sda (3 times) gave, /dev/sda: Timing cached reads: 3892 MB in 2.00 seconds = 1945.88 MB/sec Timing buffered disk reads: 182 MB in 3.02 seconds = 60.18 MB/sec /dev/sda: Timing cached reads: 4016 MB in 2.00 seconds = 2007.87 MB/sec Timing buffered disk reads: 182 MB in 3.00 seconds = 60.66 MB/sec /dev/sda: Timing cached reads: 4012 MB in 2.00 seconds = 2005.87 MB/sec Timing buffered disk reads: 184 MB in 3.02 seconds = 60.84 MB/sec ------------------------------------------------- Suse 10.2 hdparm -t -T /dev/sda (3 times) gave, /dev/sda: Timing cached reads: 2008 MB in 2.00 seconds = 1004.11 MB/sec Timing buffered disk reads: 176 MB in 3.01 seconds = 58.51 MB/sec /dev/sda: Timing cached reads: 2014 MB in 2.00 seconds = 1007.46 MB/sec Timing buffered disk reads: 184 MB in 3.02 seconds = 60.98 MB/sec /dev/sda: Timing cached reads: 2064 MB in 2.00 seconds = 1032.47 MB/sec Timing buffered disk reads: 176 MB in 3.01 seconds = 58.43 MB/sec ------------------------------------------------- I also installed and ran bonnie on both with results, Suse 10.0 ---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (03)- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU linux100 1*1000 40748 99.6105847 22.9 28052 7.7 28561 55.0 61974 9.9 744.9 2.2 Suse 10.2 ---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (03)- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU linux102 1*1000 30340 97.2 90815 20.1 25670 6.1 19712 74.1 66955 11.2 466.3 1.2 As you can see the disk i/o appears to be significantly slower on suse 10.2. Can anyone shed any light on this? Regards, Ian. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.