On Sun, Feb 17, 2013 at 09:20:46PM +0530, Subranshu Patel wrote: > I created 2 filesystem on my system (RHEL 6.3, kernel 2.6.32) - XFS > and EXT4 and mounted them. > > On both the filesystem I executed a program which performed the following: > - Create large number of directories > - Removing all the directories > > During the execution of the program, I monitored the %user and %system > CPU usage (using sar command) > > For EXT4 the %user was 1% and %system was 21% > For XFS the %user was 20% and %system was 52% > > But I am not able to understand %user consumption, since %user reports > the CPU usage of the user level (application), shouldn't it be the > same for both EXT4 and XFS? Perf is your friend. > What are the factors that decide the %user component keeping in mind > that only the filesystem is different? Page faults, CPU cache misses. XFS has a significantly large icache and dcache footprint than ext4, so those are the likely causes. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
