On Fri, Dec 12, 2014 at 02:03:32PM +0800, alex chen wrote: > This commit 0e3d2a6313(ext4: Fix async commit mode to be safe by using > a barrier) show that using journal_async_commit feature has a 50% > performance improvement. But I tested in SUSE Linux Enterprise Server > 11 SP3(linux kernel 3.0.93) and Red Hat Enterprise linux 6.4(linux > kernel 2.6.32), the result show this feature has no performance > improvement. > My test command: > mount /dev/sdb /mnt/sdb > ./fs_mark -d /mnt/sdb/ -s 10240 -n 1000 > umount > > mount /dev/sdb /mnt/sdb -o journal_async_commit > ./fs_mark -d /mnt/sdb/ -s 10240 -n 1000 > umount > > My test result: > FSUse% Count Size Files/sec App Overhead > 6 1000 10240 42.1 10671 > vs. > -o journal_async_commit > FSUse% Count Size Files/sec App Overhead > 6 1000 10240 63.9 10625 Um, the files per second went up from 42.1 to 63.9 --- that's a 50% improvement, yes? - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
