Fajar A. Nugraha wrote:
On Thu, Mar 12, 2009 at 8:32 PM, Mark Johnson <[email protected]> wrote:
Do you have any numbers comparing disk performance?
I think I may have to redo my setup for I/O test. I'm currently using
zvol-backed storage with compression=on, and the results are kinda
weird.
On the same opensolaris dom0, tested with "dd if=/dev/zero of=test1G
bs=1M count=2048"
Windows without GPLPV: 48.3 MB/s
Windows with GPLPV: 52.8 MB/s
Linux PV: 86.5 MB/s
dom0 (zfs, compression=on): 57.7 MB/s
So ext3 on zvol is faster than zfs? Is it the effect of compression=on
and if=/dev/zero?
Windows domU and Linux PV has 1000MB memory, on Windows dd was from
cygwin. dom0 was left with 984 MB memory.
zero is easy to compress, so probably not a good example :-)
I'm not sure what effect compression might have other than
that, but if your using zfs in dom0, you should limit the
size of the arc.
echo "set zfs:zfs_arc_max = 0x10000000" >> /etc/system
If your using a disk file (vs a zvol) on a zfs filesystem,
you should set the recordsize for that fs to 8k. zvols
already default to 8k.
zfs set recordsize=8k rpool/guests
MRJ
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