Re: very slow writes with softdep enabled on mpi(4)

2011-07-30 Thread Mattieu Baptiste
On Sat, Jul 30, 2011 at 1:38 AM, Mattieu Baptiste wrote: > On Fri, Jul 29, 2011 at 11:58 PM, Ted Unangst wrote: >> On Fri, Jul 29, 2011, Mattieu Baptiste wrote: >> >>> After digging around this problem with help from Pedro, I noticed that >>> a 4.9-release kernel works ok, whereas a 5.0-beta does

Re: very slow writes with softdep enabled on mpi(4)

2011-07-29 Thread Mattieu Baptiste
On Fri, Jul 29, 2011 at 11:58 PM, Ted Unangst wrote: > On Fri, Jul 29, 2011, Mattieu Baptiste wrote: > >> After digging around this problem with help from Pedro, I noticed that >> a 4.9-release kernel works ok, whereas a 5.0-beta does not. So I tried >> to identify which commit was responsible and

Re: very slow writes with softdep enabled on mpi(4)

2011-07-29 Thread Ted Unangst
On Fri, Jul 29, 2011, Mattieu Baptiste wrote: > After digging around this problem with help from Pedro, I noticed that > a 4.9-release kernel works ok, whereas a 5.0-beta does not. So I tried > to identify which commit was responsible and found out this one is > responsible of *very* slow writes w

Re: very slow writes with softdep enabled on mpi(4)

2011-07-29 Thread Mattieu Baptiste
On Mon, Jul 25, 2011 at 5:54 PM, Mattieu Baptiste wrote: > Hi all, > > It's really weird. I see very slow writes when softdep is enabled. > Write caches seem to be enabled on disks. Utilities like bonnie++ > confirm that writes are very slow with softdep enabled (although it > helps with lots of f

very slow writes with softdep enabled on mpi(4)

2011-07-25 Thread Mattieu Baptiste
Hi all, It's really weird. I see very slow writes when softdep is enabled. Write caches seem to be enabled on disks. Utilities like bonnie++ confirm that writes are very slow with softdep enabled (although it helps with lots of file creations). This happens whether I use native disks or RAID 1 vol