Michael Lang
2005-Jun-05 09:30 UTC
[Xen-users] IDE Disc Performance problems with Xen3-unstable
Hi everyone,
ive encountered performance problems with Xen3-unstable and a raid5 with 5 120Gb
Maxtor IDE discs (1 Spare). After testing in different Kernels i also noticed
that ''normal'' IDE Disc access is very slow
using Whitebox Linux 4 (eq RHEL 4) the performance seems to be okay for this IDE
Raid, but using Xen3-unstable Domain-0 the Performance is incredible slow ...
does anyone know why ?
here are the bonnie results, using the configuration
1 IDE Disc + LVM (physical Disc benchmark)
4 IDE Discs Raid5 + LVM (raid5)
thanks for any hint
Kind regards
Michael Lang
Whitebox 4 original Kernel
# bonnie -d tmp/ -s 100 -v 5 -p 2
Bonnie: Warning: You have 1011MB RAM, but you test with only 100MB datasize!
Bonnie: This might yield unrealistically good results,
Bonnie: for reading and seeking and writing.
Bonnie 1.4: File ''tmp//Bonnie.3645'', size: 104857600, volumes:
5
Writing with putc()... done: 17308 kB/s 77.2 %CPU
Rewriting... done: 64234 kB/s 41.6 %CPU
Writing intelligently... done: 53365 kB/s 30.4 %CPU
Reading with getc()... done: 21202 kB/s 91.0 %CPU
Reading intelligently... done: 369841 kB/s 99.9 %CPU
Seek numbers calculated on first volume only
Seeker 1...Seeker 2...start ''em...done...done...
---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek-
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (02)-
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
server 5* 100 17308 77.2 53365 30.4 64234 41.6 21202 91.0369841 99.9 32015.1
97.6
Whitebox 4 xen3-unstable Kernel physical Disc
# bonnie -d . -s 100 -v 5 -p 2
Bonnie: Warning: You have 500MB RAM, but you test with only 100MB datasize!
Bonnie: This might yield unrealistically good results,
Bonnie: for reading and seeking and writing.
Bonnie 1.4: File ''./Bonnie.5678'', size: 104857600, volumes: 5
Writing with putc()... done: 3431 kB/s 85.6 %CPU
Rewriting... done: 1898 kB/s 52.8 %CPU
Writing intelligently... done: 4248 kB/s 67.7 %CPU
Reading with getc()... done: 3414 kB/s 74.4 %CPU
Reading intelligently... done: 5203 kB/s 69.1 %CPU
Seek numbers calculated on first volume only
Seeker 1...Seeker 2...start ''em...done...done...
---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek-
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (02)-
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
server 5* 100 3431 85.6 4248 67.7 1898 52.8 3414 74.4 5203 69.1 165.1 0.4
Whitebox 4 xen3-unstable Kernel raid5
# bonnie -d tmp/ -s 100 -v 5 -p 2
Bonnie: Warning: You have 500MB RAM, but you test with only 100MB datasize!
Bonnie: This might yield unrealistically good results,
Bonnie: for reading and seeking and writing.
Bonnie 1.4: File ''tmp//Bonnie.5605'', size: 104857600, volumes:
5
Writing with putc()... done: 6613 kB/s 44.2 %CPU
Rewriting... done: 4501 kB/s 7.5 %CPU
Writing intelligently... done: 8698 kB/s 19.8 %CPU
Reading with getc()... done: 7867 kB/s 46.6 %CPU
Reading intelligently... done: 11836 kB/s 7.3 %CPU
Seek numbers calculated on first volume only
Seeker 1...Seeker 2...start ''em...done...done...
---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek-
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (02)-
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
server 5* 100 6613 44.2 8698 19.8 4501 7.5 7867 46.6 11836 7.3 269.9 2.0
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Ian Pratt
2005-Jun-05 12:48 UTC
RE: [Xen-users] IDE Disc Performance problems with Xen3-unstable
> ive encountered performance problems with Xen3-unstable and a > raid5 with 5 120Gb Maxtor IDE discs (1 Spare). After testing > in different Kernels i also noticed that ''normal'' IDE Disc > access is very slowIf you''re using our 2.4.6.11.11-xen0 kernel, have you checked the correct driver for your IDE controller is compiled in? Ian _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Michael Lang
2005-Jun-05 16:18 UTC
RE: [Xen-users] IDE Disc Performance problems with Xen3-unstable
> -----Original Message----- > From: xen-users-bounces@lists.xensource.com > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Ian Pratt > Sent: Sonntag, 05. Juni 2005 14:49 > To: Michael Lang; xen-users@lists.xensource.com > Cc: ian.pratt@cl.cam.ac.uk > Subject: RE: [Xen-users] IDE Disc Performance problems with > Xen3-unstable > > > > > ive encountered performance problems with Xen3-unstable and a > > raid5 with 5 120Gb Maxtor IDE discs (1 Spare). After testing in > > different Kernels i also noticed that ''normal'' IDE Disc > access is very > > slow > > If you''re using our 2.4.6.11.11-xen0 kernel, have you checked > the correct driver for your IDE controller is compiled in? >thanks, seems that i missed this one :) Raid5 Discs # bonnie -d . -s 100 -v 5 -p 2 Bonnie: Warning: You have 500MB RAM, but you test with only 100MB datasize! Bonnie: This might yield unrealistically good results, Bonnie: for reading and seeking and writing. Bonnie 1.4: File ''./Bonnie.5568'', size: 104857600, volumes: 5 Writing with putc()... done: 24393 kB/s 77.3 %CPU Rewriting... done: 16383 kB/s 10.1 %CPU Writing intelligently... done: 40455 kB/s 22.7 %CPU Reading with getc()... done: 23184 kB/s 60.9 %CPU Reading intelligently... done: 52382 kB/s 17.8 %CPU Seek numbers calculated on first volume only Seeker 1...Seeker 2...start ''em...done...done... ---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (02)- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU server 5* 100 24393 77.3 40455 22.7 16383 10.1 23184 60.9 52382 17.8 289.5 0.8 Physical Disc # bonnie -d . -s 100 -v 5 -p 2 Bonnie: Warning: You have 500MB RAM, but you test with only 100MB datasize! Bonnie: This might yield unrealistically good results, Bonnie: for reading and seeking and writing. Bonnie 1.4: File ''./Bonnie.5582'', size: 104857600, volumes: 5 Writing with putc()... done: 35985 kB/s 96.8 %CPU Rewriting... done: 13909 kB/s 8.2 %CPU Writing intelligently... done: 46646 kB/s 19.6 %CPU Reading with getc()... done: 18230 kB/s 50.0 %CPU Reading intelligently... done: 39141 kB/s 9.3 %CPU Seek numbers calculated on first volume only Seeker 1...Seeker 2...start ''em...done...done... ---Sequential Output (nosync)--- ---Sequential Input-- --Rnd Seek- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --04k (02)- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU server 5* 100 35985 96.8 46646 19.6 13909 8.2 18230 50.0 39141 9.3 201.2 0.6> Ian > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users