On Wed, Jun 27, 2012 at 07:02:45PM -0400, Eric Sandeen wrote: > On 6/27/12 3:30 PM, Theodore Ts'o wrote: > > A better workload would be to use a blocksize of 4k. By using a > > blocksize of 1024k, it's not surprising that the metadata overhead is > > in the noise. > > > > Try something like this; this will cause the extent tree overhead to > > be roughly equal to the data block I/O. > > > > [global] > > rw=randwrite > > size=128m > > filesize=1g > > bs=4k > > ioengine=sync > > fallocate=1 > > fsync=1 > > > > [thread1] > > filename=testfile Hi Eric, Could you please run this test with 'journal_async_commit' flag. In my previous test, this feature can dramatically improve the performance of uninitialized extent conversion. I have sent an email to do a similar test [1]. In that email, I do a similar test and the journal_async_commit flag quite can improve the performance. 1. http://comments.gmane.org/gmane.linux.file-systems/63569 Regards, Zheng -- 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
