Date: Sun, 14 Feb 2010 17:28:28 +0000 From: Jonathan Belson <jon@witchspace.com> To: freebsd-stable@freebsd.org Subject: More zfs benchmarks Message-ID: <EC10D2E9-04C7-4976-B377-62E79D9BE47A@witchspace.com>
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Hiya After reading some earlier threads about zfs performance, I decided to = test my own server. I found the results rather surprising... The machine is a Dell SC440, dual core 2GHz E2180, 2GB of RAM and ICH7 = SATA300 controller. There are three Hitachi 500GB drives = (HDP725050GLA360) in a raidz1 configuration (version 13). I'm running = amd64 7.2-STABLE from 14th Jan. First of all, I tried creating a 200MB file on / (the only non-zfs = partition): # dd if=3D/dev/zero of=3D/root/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 6.158355 secs (34053769 bytes/sec) # dd if=3D/dev/zero of=3D/root/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 5.423107 secs (38670674 bytes/sec) # dd if=3D/dev/zero of=3D/root/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 6.113258 secs (34304982 bytes/sec) Next, I tried creating a 200MB file on a zfs partition: # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 58.540571 secs (3582391 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 46.867240 secs (4474665 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 21.145221 secs (9917853 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 19.387938 secs (10816787 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 21.378161 secs (9809787 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D200 200+0 records in 200+0 records out 209715200 bytes transferred in 23.774958 secs (8820844 bytes/sec) Ouch! Ignoring the first result, that's still over three times slower = than the non-zfs test. With a 2GB test file: # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 547.901945 secs (3827605 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 595.052017 secs (3524317 bytes/sec) # dd if=3D/dev/zero of=3D/tank/test/zerofile.000 bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 517.326470 secs (4053827 bytes/sec) Even worse :-( Reading 2GB from a raw device: dd if=3D/dev/ad4s1a of=3D/dev/null bs=3D1M count=3D2000 1024+0 records in 1024+0 records out 1073741824 bytes transferred in 13.914145 secs (77169084 bytes/sec) =20 Reading 2GB from a zfs partition (unmounting each time): dd if=3D/tank/test/zerofile.000 of=3D/dev/null bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 29.905155 secs (70126772 bytes/sec) dd if=3D/tank/test/zerofile.000 of=3D/dev/null bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 32.557361 secs (64414066 bytes/sec) dd if=3D/tank/test/zerofile.000 of=3D/dev/null bs=3D1M count=3D2000 2000+0 records in 2000+0 records out 2097152000 bytes transferred in 34.137874 secs (61431828 bytes/sec) For reading, there seems to be much less of a disparity in performance. I notice that one drive is on atapci0 and the other two are on atapci1, = but surely it wouldn't make this much of a difference to write speeds? Cheers, --Jon
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