Re: OT: performance problems.
On Thu, Jan 10, 2002 at 07:51:19AM +0800, csj wrote:
> On Tue, 8 Jan 2002 23:11:46 +0100
> Theo Wribe <theo.wribe@telia.com> wrote:
>
> > On Tue, Jan 08, 2002 at 02:00:27PM -0800, Brian Nelson wrote:
> > > It's all about scsi baby...
> > >
> > > /dev/sdb:
> > > Timing buffer-cache reads: 128 MB in 0.78 seconds =164.10 MB/sec
> > > Timing buffered disk reads: 64 MB in 1.62 seconds = 39.51 MB/sec
> >
> > My Western Digital 80G 7200RPM is pretty good too.
> >
> > /dev/hdb:
> > Timing buffer-cache reads: 128 MB in 0.80 seconds =160.00 MB/sec
> > Timing buffered disk reads: 64 MB in 1.58 seconds = 40.51 MB/sec
>
> Now that's something to get jealous over. How did you manage the
> additional 20MB over mine (20MB+/sec)? Is it just the RPM's or some
> other kernel compile option or hdparm paramater? Please don't tell me to
> RTFM. 20MB/sec is the most I could get from all my fine reading and
> tweaking. Also, I'm curious: anybody there who's managed to get even
> half of the theoretical UDMA 100?
>
RTFM - Just kidding ;> Thing I did was to compile my kernel with support
for Intel IDE controllers. Rebooted and got nice preformance. After that
I ran hdparm -c3 for I/O support in 32bit w/sync but It did just give me
an increase of 2-4MB/sec. Im pretty happy with the speed overall.
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