rvalles wrote: >On Tue, Jul 11, 2006 at 03:04:20PM -0700, Hans Reiser wrote: > > >>Please feel free to comment on this list and the order of its tasks: >>4) review complaints of pauses while using reiser4 --- size of task >>unknown, and it is also unknown how much we may have fixed it while >>writing recent patches. >> >>6) optimize fsync --- substantive task which requires using fixed area >>for write twice logging, and using write twice logging for fsync'd >>data. It might require creating mount options to choose whether to >>optimize for serialized sequential fsyncs vs. lazy fsyncs. >> >> >> >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....
Hans
