Date: Fri, 01 May 2009 16:42:09 -0400 From: Mike Tancsa <mike@sentex.net> To: freebsd-stable@freebsd.org Subject: current zfs tuning in RELENG_7 (AMD64) suggestions ? Message-ID: <200905012041.n41Kf47B045440@lava.sentex.ca>
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I gave the AMD64 version of 7.2 RC2 a spin and all installed as
expected off the dvd
INTEL S3200SHV MB, Core2Duo, 4G of RAM
In the past it had been suggested that for zfs tuning, something like
vm.kmem_size_max="1073741824"
vm.kmem_size="1073741824"
vfs.zfs.prefetch_disable=1
However doing a simple test with bonnie and dd, there does not seem
to be very much difference in 4 configs. Am I better off just with
the defaults ? The machine is acting as anoffline storage site, so a
steady stream of data via rsync/ssh
The writes are all within the normal variance of the tests except for
b). Is there anything else that should be tuned ? Not that I am
looking for any "magic bullets" but I just want to run this backup
server as best as possible
-------Sequential Output-------- ---Sequential Input--
--Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block---
--Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
a 5000 98772 54.7 153111 31.5 100015 21.1 178730 85.3 368782
32.5 161.6 0.6
b 5000 101271 57.9 154765 31.5 61325 13.9 176741 84.6 372477
32.8 149.3 0.6
c 5000 102331 57.1 159559 29.5 105767 17.4 144410 63.8 299317
19.9 167.9 0.6
d 5000 107308 58.6 175004 32.4 117926 18.8 143657 63.4 305126
20.0 167.6 0.6
a) defaults
b) vm.kmem_size_max="1073741824" vm.kmem_size="1073741824"
c) vfs.zfs.prefetch_disable=1 plus b)
d) vfs.zfs.zil_disable="1" plus c) plus b)
Results tend to fluctuate a bit.
offsitetmp# dd if=/dev/zero of=/tank1/test bs=2048k count=1000
1000+0 records in
1000+0 records out
2097152000 bytes transferred in 10.016818 secs (209363092 bytes/sec)
offsitetmp#
offsitetmp# dd if=/dev/zero of=/tank1/test bs=2048k count=1000
1000+0 records in
1000+0 records out
2097152000 bytes transferred in 10.733547 secs (195382943 bytes/sec)
offsitetmp#
Drives are raidz
ad1: 1430799MB <Seagate ST31500341AS CC1H> at ata3-master SATA300
ad2: 1430799MB <Seagate ST31500341AS CC1H> at ata4-master SATA300
ad3: 1430799MB <Seagate ST31500341AS CC1H> at ata5-master SATA300
ad4: 1430799MB <Seagate ST31500341AS CC1H> at ata6-master SATA300
on ich9
---Mike
--------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet since 1994 www.sentex.net
Cambridge, Ontario Canada www.sentex.net/mike
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