:I had not enough time to do long benchmarks on the machine anymore.
:Howewer, I can now use another one with only 4GB memory. How many iterations
:do you think would be enough to do a good test with this quantity of RAM ?
--iterations=100 should be fine for 4GB of ram.
:> Linear write activity. I wonder why it isn't
:> clustering the I/O's, though.
:
:That was newfs_hammer
ok, makes sense.
:> Try setting vfs.hammer.double_buffer=1.
:
:Will do in a future test.
:
:> : 0 3 15.94 288 4.48 1 0 85 0 14
:> : 0 3 16.00 620 9.69 1 0 79 0 20
:> : 0 3 16.00 352 5.50 1 0 84 0 15
:>
:> This doesn't look good either. It shouldn't degrade that much,
:> though it's a bit hard to tell with iostat because it doesn't print
:> the disk busy %.
:
:What could I use to get meaningful data ?
:
:--
:Francois Tigeot
systat -vm 1 breaks the I/O down into reads and writes, but of course
that's a visual view rather than a table so it can't really be dumped
to a file.
-Matt
Matthew Dillon
<dil...@backplane.com>
