saul at cvs.anu.edu.au
Fri Jun 28 14:56:25 EST 2002
I would have thought the filesystem has no effect on speed reported by
hdparm. Doesn't it just read from the raw device (/dev/sda)?
Anyway, does seem very slow. I get 40 MB/s on each IDE disk, they are
software striped to give about 72 MB/s.
On Fri, 28 Jun 2002, Simon Fowler wrote:
> > BTW:
> > # hdparm -T -t /dev/sda
> > /dev/sda:
> > Timing buffer-cache reads: 128 MB in 0.79 seconds =162.03 MB/sec
> > Timing buffered disk reads: 64 MB in 4.12 seconds = 15.53 MB/sec
> This last one is rather slow - my 7200rpm IDE disk gets 22-23MB/s
> off the platters, and I'd expect a good scsi disk to be a good bit
> faster . . .
> What filesystem are you using with this? ext3 is currently not at
> all well optimised for SMP, so if you're using that you may be
> seeing the results . . . Try mounting with ext2 instead, and see if
> that fixes things.
> Other than that, I can't think of anything right now, but you
> definitely shouldn't be seeing that kind of slowdown.
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