Re: poor sata performance on 2.6

[Lenar Lõhmus]

Konstantin Sobolev wrote:

> Hi,
>
> /dev/hde:
> Timing buffer-cache reads:   1436 MB in  2.00 seconds = 717.03 MB/sec
> Timing buffered disk reads:  100 MB in  3.03 seconds =  32.95 MB/sec
>
> for sata_sil:
>
> /dev/sda:
> Timing buffer-cache reads:   1412 MB in  2.00 seconds = 705.05 MB/sec
> Timing buffered disk reads:   84 MB in  3.06 seconds =  27.43 MB/sec
>
> So my old IDE HDD appears to be considerably faster. Expected results were 
> 55-70MB/s.
>  
With same hard drive connected to 3ware S-ATA controller I got 
40-50MB/sec with hdparm on 2.6.4 and 2.6.5. Then
tried to hdparm -a 8192 /dev/sda, and got this:

/dev/sda:
Timing buffer-cache reads:   2056 MB in  2.00 seconds = 1027.13 MB/sec
Timing buffered disk reads:  266 MB in  3.00 seconds =  88.53 MB/sec

So you may try that switch, maybe helps.

Lenar
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