RE: VIA VT8251 low performance (was: ASUS A8V-MX)
> > Here are the drives I used for testing on this
> > VT8251 (AHCI) south bridge on Asus A8V-VM:
> >
> > - Western Digital WD1600 Caviar SE 160 GB 7k2 RPM
> > - Hitacht DeskStar T7K250 HDT722525DLA300 250 GB 7k2 RPM
> >
> > Both with about the same results.
> >
> > @Lennart: Do you think these drives can't give
> > a better performace?
>
> I think they should be able to. Which kernel version are you
> running? I am mainly using 2.6.15 and 2.6.16 at this time.
I have 2.6.16.5-amd64-k8-smp from kernel.org with small patches
to drivers/scsi/ahci.c and drivers/scsi/sata_via.c to make
VT8251 SATA available.
> > > /tmp is residing not on the sata hdd but on an old ide
> > > disk doing 7200 rpm.
>
> That is one way to slow down /tmp. Usually the oposite is
> desired,hence the often used tmpfs for /tmp.
that is on Raghavendra's system...
> > can you please measure the speed you're getting on
> > VT8251 / SATA?
>
> Well the speed I get here is:
> Asus A8V Deluxe: Via VT6420 SATA controller with WD2500JD
> drive: Timing buffered disk reads: 172 MB in 3.01 seconds
> = 57.17 MB/sec
>
> Asus P4P800: Intel ICH5R SATA controller with WD1600JD drive:
> Timing buffered disk reads: 172 MB in 3.01 seconds = 57.21 MB/sec
>
> Asus P4P800: Promise TX2200 SATA controller with WD2500JD
> drive: Timing buffered disk reads: 176 MB in 3.02 seconds
> = 58.21 MB/sec
>
> Asus A7N8X-E Deluxe: Sil3112A SATA controller with WD1200JD
> drive: Timing buffered disk reads: 152 MB in 3.04 seconds
> = 50.07 MB/sec
Well, I am getting about the same with Asus A8V-VM (and VT8251).
It is that I was expecting more...
Zrin
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