It was going with 32k just REALLY slow, will use 128k+
1073737728 2007-06-25 13:07 Bonnie.5178.000
On Mon, 25 Jun 2007, Justin Piszcz wrote:
On Mon, 25 Jun 2007, Justin Piszcz wrote:
On Mon, 25 Jun 2007, Bill Davidsen wrote:
Justin Piszcz wrote:
I have found a 16MB stripe_cache_size results in optimal performance
after testing many many values :)
We have discussed this before, my experience has been that after 8 x
stripe size the performance gains hit diminishing returns, particularly
for typical write instead of big aligned blocks, possibly with O_DIRECT. I
would suggest that as a target even on a low memory machine.
Do your tests show similar? I was only able to test three and four drive
setups using dedicated drives.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
I will re-benchmark with my current setup, however:
Each of these are averaged over three runs:
128k_stripe: 69.2MB/s
256k_stripe: 105.3MB/s
512k_stripe: 142.0MB/s
1024k_stripe: 144.6MB/s
2048k_stripe: 208.3MB/s
4096k_stripe: 223.6MB/s
8192k_stripe: 226.0MB/s
16384k_stripe: 215.0MB/s
This was with 6 sata disks.
Justin.
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I set it to 32 and my machine has several hung processes in D state, not
good. I will start with 128k and up.
Justin.
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