On 2014/12/12 22:54, Theodore Ts'o wrote: > 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 Yes, I understand it. Thank you! > -- > 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 > > -- 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
