You have to use zero rotation delay to newfs to see an improvement. Do
you have that?
---------------------------------------------------------------------------
>
> 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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> >
>
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--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
