On Sun, 07 Jun 2009 00:11:13 +0900 (JST), Ryusuke Konishi wrote: > Hi, > On Sat, 6 Jun 2009 16:49:28 +0300, [email protected] wrote: > > On Sat, Jun 06, 2009 at 04:56:53AM +0900, Ryusuke Konishi wrote: > > > Hi, > > > On Fri, 5 Jun 2009 22:32:56 +0300, [email protected] wrote: > > > > Sorry for the late reply . > > > > > > > > I tried to use deplock but I always get this : > > > > SysRq : Show Locks Held > > > > INFO: lockdep is turned off. > > > > > > > > sysrq t works . I hope the attached file will be helpful . > > > > > > Thanks for the log! > > > > > > According to you log, the performance problem seems to be caused > > > by a wait function in segment constructor of nilfs. > > > > > > If you have a chance, please try the following coupled patch which > > > comes from two patches queued for 2.6.31. The upper half of the patch > > > greatly improves read performance, and the lower part may have effect > > > on the write performance. > > > > > > Regards, > > > Ryusuke Konishi > > > > Unfortunately , the patches didn't help . I tried another flash disk. I > > tried another archive (.tar.gz this time) and the problem is still > > there . > > > > Is It possible the problem is related to snapshotting ? (the pauses > > happen around 7 times in 40 seconds) > > I think the pause is related to garbage collection. What will happen > if you mount the partition with -i option ? > > # mount -t nilfs2 -i /dev/xxx /mnt/media > > This option skips invoking the garbage collector (cleanerd).
Oops, your log shows the cleanerd is sleeping. So, the 5 seconds interval likely comes from regular writeback by the segment constructor thread. Could you tell me the product name of your USB flash ? I will try expansion of a rar file against my pendrive (cruzer) Thanks, Ryusuke Konishi > If it raises throughput, you can adjust by slowing down cleanerd by > rewriting /etc/nilfs_cleanerd.conf (a HUP signal must be sent to the > cleanerd to reflect the change): > > # The maximum number of segments to be cleaned at a time. > - nsegments_per_clean 2 > + nsegments_per_clean 1 > > # Cleaning interval in seconds > - cleaning interval 5 > + cleaning interval 10 > > > Thanks, > Ryusuke Konishi > _______________________________________________ > users mailing list > [email protected] > https://www.nilfs.org/mailman/listinfo/users _______________________________________________ users mailing list [email protected] https://www.nilfs.org/mailman/listinfo/users
