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Re: VIA VT8251 low performance (was: ASUS A8V-MX)



On Tue, May 09, 2006 at 05:29:52PM +0200, Ziborski KEG wrote:
> This calls for additional testing.
> 
> 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.

> > /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.

> 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

If it gets a lot less than that I really wonder if something is keeping
the disk busy, or if there is another problem with the setup of the
system.

Len Sorensen



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