Re: 2.5.67-mm4

[Toon van der Pas]

On Fri, Apr 18, 2003 at 01:45:36AM -0700, Andrew Morton wrote:
> 
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.67/2.5.67-mm4/
> 
> . A bunch of anticipatory scheduler patches.
> 
>   For the first time ever, AS is working well with both IDE and SCSI
>   under all the usual tests.
> 
>   It works just fine on SCSI with zero TCQ tags, and with four TCQ tags. 
>   At eight tags, read-vs-write performace is starting to measurably drop off.
>   At 32 tags it is about 2000x slower than at zero or four tags.
> 
>   My recommendation, as always, is to disable SCSI TCQ completely.  If you
>   really must, set it to four tags.

What about drivers that bypass de SCSI layer?
I administer a server with a Mylex RAID controller (DAC960)...

Regards,
Toon.