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.
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