Joel Becker wrote: > On Mon, May 07, 2012 at 04:21:27PM -0700, Srinivas Eeda wrote: > >> can you please review following 3 patches that implement discontiguous >> localalloc bitmap support for ocfs2 file system. This feature helps >> applications that significantly fragment the filesystem. >> > > Hi Srini. Have you some performance numbers backing this? That > is, I believe that the described filesystem turned off local alloc. Do > you have proof that these patches, turning it back on, improved the > customer's performance? > > Joel > Hi Joel,
thanks a lot for the quick reply. I have some stat_sysdir.sh snapshots at http://oss.oracle.com/~seeda/diag/stat_sysdir/ collected from a system. It has 4 snapshots collected when the file system usage is at 8%, 19%, 21% and 52%. In file stat_sysdir_52_percent_usage_slow_del.out, for the filesystem that has UUID: 3A6F54DF288C4AF2ABD1E00FC49BE7ED you could see that local_alloc:0000 bitmap total is 38 and is 0(disabled) for local_alloc:0001, and local_alloc:0002. for the filesystem that has uuid AC444DB162AE427C899BA89E076DD479, all localalloc appears to be disabled. Sorry I didn't collect /sys/kernel/debug/fs/<uuid>/fs_state. But, given the file system state, even if localalloc is not disabled localalloc need to be refilled every 40 clusters. Thanks, --Srini _______________________________________________ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com http://oss.oracle.com/mailman/listinfo/ocfs2-devel