FWIW, I have some IBM-DPTA-372050 and after enabling TCQ with FreeBSD
I barely noticed any improvement, and occasionally strange error messages
appeared, so I disabled it again. I believe you need more recent
drives (with updated firmware, no doubt) to get any performance gain..
- Andrew
On Thu, 6 Dec 2001, Tomaz Borstnar wrote:
> At 18:35 27.9.2001, Bruce Momjian wrote the following message:
> >Well, SCSI with tagged queueing allows you to send multiple disk
> >requests to the drive and the drive orders them to be optimal. Only the
> >drive knows there the head it at a given moment so it seems good to push
> >such optimizations into the disk drive.
>
> IBM Deskstar drives DPTA and DLTA and new IC35 all have tagged queuing.
> FreeBSD supports that and the results are impressive - lower CPU usage and
> faster disks.
>
>
>
> ----
> Tomaz Borstnar <tomaz.borstnar@over.net>
> "Love is the answer to the final question you ask" - Unknown
>
>
>
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