Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2013-03-07 Thread Jan Kara
On Wed 06-03-13 20:05:58, Harshana Ranmuthu wrote: > > I don't know how to fix the issue without reverting the patch. Sorry. > > with reference to post URL > http://marc.info/?l=linux-fsdevel&m=134997043820759&w=2 > > I was going through this post, as we are also having problems with the > same

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2013-03-06 Thread Harshana Ranmuthu
> I don't know how to fix the issue without reverting the patch. Sorry. with reference to post URL http://marc.info/?l=linux-fsdevel&m=134997043820759&w=2 I was going through this post, as we are also having problems with the same commit. In our case, we are appending to a file rather than upda

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2012-10-11 Thread Jan Kara
On Thu 11-10-12 13:58:00, Viktor Nagy wrote: > >The regression you observe is caused by commit 3d08bcc8 "mm: Wait for > >writeback when grabbing pages to begin a write". At the first sight I was > >somewhat surprised when I saw that code path in the traces but later > >when I > >>>

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2012-10-11 Thread Jan Kara
On Thu 11-10-12 11:52:54, Viktor Nagy wrote: > On 2012.10.10. 22:27, Jan Kara wrote: > >On Wed 10-10-12 22:44:41, Viktor Nagy wrote: > >>On 10/10/2012 06:57 PM, Jan Kara wrote: > >>> Hello, > >>> > >>>On Tue 09-10-12 11:41:16, Viktor Nagy wrote: > Since Kernel version 3.0 pdflush blocks write

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2012-10-11 Thread Viktor Nagy
Hi, On 2012.10.10. 22:27, Jan Kara wrote: On Wed 10-10-12 22:44:41, Viktor Nagy wrote: On 10/10/2012 06:57 PM, Jan Kara wrote: Hello, On Tue 09-10-12 11:41:16, Viktor Nagy wrote: Since Kernel version 3.0 pdflush blocks writes even the dirty bytes are well below /proc/sys/vm/dirty_bytes or

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2012-10-10 Thread Jan Kara
On Wed 10-10-12 22:44:41, Viktor Nagy wrote: > On 10/10/2012 06:57 PM, Jan Kara wrote: > > Hello, > > > >On Tue 09-10-12 11:41:16, Viktor Nagy wrote: > >>Since Kernel version 3.0 pdflush blocks writes even the dirty bytes > >>are well below /proc/sys/vm/dirty_bytes or /proc/sys/vm/dirty_ratio. >

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2012-10-10 Thread Viktor Nagy
Hi, On 10/10/2012 06:57 PM, Jan Kara wrote: Hello, On Tue 09-10-12 11:41:16, Viktor Nagy wrote: Since Kernel version 3.0 pdflush blocks writes even the dirty bytes are well below /proc/sys/vm/dirty_bytes or /proc/sys/vm/dirty_ratio. The kernel 2.6.39 works nice. How this hurt us in the rea

Re: Linux 3.0+ Disk performance problem - wrong pdflush behaviour

2012-10-10 Thread Jan Kara
Hello, On Tue 09-10-12 11:41:16, Viktor Nagy wrote: > Since Kernel version 3.0 pdflush blocks writes even the dirty bytes > are well below /proc/sys/vm/dirty_bytes or /proc/sys/vm/dirty_ratio. > The kernel 2.6.39 works nice. > > How this hurt us in the real life: We have a very high performance