Re: poor sata performance on 2.6

Konstantin Sobolev
2004-04-15T10:37:53Z

On Thursday 15 April 2004 11:12, Lenar Lõhmus wrote:
> >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.

unfortunately it doesn't:

/dev/sda:
setting fs readahead to 8192
readahead = 8192 (on)
Timing buffered disk reads: 84 MB in 3.06 seconds = 27.46 MB/sec
--
/KoS
* Searching for light in the darkness of insanity.