On Tue, Jun 26, 2012 at 04:44:08PM -0400, Eric Sandeen wrote: > > > > I tried running this fio recipe on v3.3, which I think does a decent job of > > emulating the situation (fallocate 1G, do random 1M writes into it, with > > fsyncs after each): > > > > [test] > > filename=testfile > > rw=randwrite > > size=1g > > filesize=1g > > bs=1024k > > ioengine=sync > > fallocate=1 > > fsync=1 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 - 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
