Bad SATA (Sil 3112A) performance with kernel 2.6.8

[James Wilkinson]

Andrey Andreev wrote:
> I upgraded my 2.6.6 kernel to 2.6.8 (the fedora update). I run a SATA 
> drive on a Sil 3112A controller. I quickly noticed that the SATA drive 
> was no longer visible under /dev/hde, but under /dev/sda, fixed my 
> fstab, etc.
> 
> However, as Sil 3112 has had very varied performance with different 
> kernels, and there obviously was a change in the way it worked, I ran:
> 
> [andrei at brie andrei]$ sudo /sbin/hdparm -t -T /dev/sda
> /dev/sda:
>  Timing buffer-cache reads:   1564 MB in  2.00 seconds = 780.95 MB/sec
>  Timing buffered disk reads:   44 MB in  3.12 seconds =  14.11 MB/sec
> 
> Which is pretty awfuly slow, compared to 2.6.6 (over 50 MB/sec). 

Slow enough for PIO: what does hdparm -d /dev/sda report?

James.

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