Re: poor sata performance on 2.6

Lenar Lõhmus
2004-04-15T07:12:37Z

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