Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Valerie Clement
Jens Axboe wrote: On Thu, Apr 19 2007, Valerie Clement wrote: Jens Axboe wrote: On Thu, Apr 19 2007, Valerie Clement wrote: Jens Axboe wrote: Please tell me how you are running ffsb, and also please include a dmessg from a booted system. Hi, our mails crossed! please see my response to Andr

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Jens Axboe
On Thu, Apr 19 2007, Valerie Clement wrote: > Jens Axboe wrote: > >On Thu, Apr 19 2007, Valerie Clement wrote: > >>Jens Axboe wrote: > >>>Please tell me how you are running ffsb, and also please include a > >>>dmessg from a booted system. > >>> > >>Hi, > >>our mails crossed! please see my response

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Valerie Clement
Jens Axboe wrote: On Thu, Apr 19 2007, Valerie Clement wrote: Jens Axboe wrote: Please tell me how you are running ffsb, and also please include a dmessg from a booted system. Hi, our mails crossed! please see my response to Andrew. You could reproduce the problem with dd command as suggested

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Jens Axboe
On Thu, Apr 19 2007, Jens Axboe wrote: > On Thu, Apr 19 2007, Valerie Clement wrote: > > Jens Axboe wrote: > > >Please tell me how you are running ffsb, and also please include a > > >dmessg from a booted system. > > > > > Hi, > > our mails crossed! please see my response to Andrew. > > You could r

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Jens Axboe
On Thu, Apr 19 2007, Valerie Clement wrote: > Jens Axboe wrote: > >Please tell me how you are running ffsb, and also please include a > >dmessg from a booted system. > > > Hi, > our mails crossed! please see my response to Andrew. > You could reproduce the problem with dd command as suggested, it's

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Valerie Clement
Jens Axboe wrote: Please tell me how you are running ffsb, and also please include a dmessg from a booted system. Hi, our mails crossed! please see my response to Andrew. You could reproduce the problem with dd command as suggested, it's more easy. I'm sending you the dmesg info. For my tests

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Valerie Clement
Andrew Morton wrote: It could be due to I/O scheduler changes. Which one are you using? CFQ? Or it could be that there has been some changed behaviour at the VFS/pagecache layer: the VFS might be submitting little hunks of lots of files, rather than large hunks of few files. Or it could be a

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-19 Thread Jens Axboe
On Wed, Apr 18 2007, Valerie Clement wrote: > > Running benchmark tests (FFSB) on an ext4 filesystem, I noticed a > performance degradation (about 15-20 percent) in sequential write tests > between 2.6.19-rc6 and 2.6.21-rc4 kernels. > > I ran the same tests on ext3 and XFS filesystems and I saw

Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-18 Thread Andrew Morton
> On Wed, 18 Apr 2007 15:54:00 +0200 Valerie Clement <[EMAIL PROTECTED]> wrote: > > Running benchmark tests (FFSB) on an ext4 filesystem, I noticed a > performance degradation (about 15-20 percent) in sequential write tests > between 2.6.19-rc6 and 2.6.21-rc4 kernels. > > I ran the same tests o

Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

2007-04-18 Thread Valerie Clement
Running benchmark tests (FFSB) on an ext4 filesystem, I noticed a performance degradation (about 15-20 percent) in sequential write tests between 2.6.19-rc6 and 2.6.21-rc4 kernels. I ran the same tests on ext3 and XFS filesystems and I saw the same performance difference between the two kern