On Fri, 14 Jul 2006 00:01:49 -0700 Hans Reiser <[EMAIL PROTECTED]> wrote: > rvalles wrote: > >I believe those two are related. I'm having the "pauses" (of many > >minutes at times!) when writing to reiser4. It seems it is triggered > >mostly by the use of fsync(); NFS in sync mode manages to trigger it > >way often: I mount my old desktop's home from my new computer via > >synced NFS. > >The pauses consist in the application being frozen and the other > >applications being slowed down on their IO operations, while the > >disks writes data continously during an interval that usually last a > >minute or so, but may last many times that. It often happens with > >small files (like, when sending a mail, as it passes through the > >MTA), so I believe it probably (re)writes to disk lots of stuff that > >doesn't need to be written to disk at all. > >It only happens on reiser4 patches against 2.6.13 or newer, 2.6.12.x > >is fine. > > > > > So the pauses are experienced by a process waiting on fsync to finish? > If yes, then the problem is a very different issue from what I > thought....
I am pretty sure I triggered the same a couple of times with aMule, which was downloading and uploading about 20-30kB per second in each direction, and randomly accessing larger files. Doing a sync then suddenly caused the disk seek like crazy and write about 500kB per second constantly. I waited about a minute, and then better killed aMule. Could it be possible that sync tries to sync the writes which arrive during the operation and cannot catch up? -- Jindrich Makovicka
