From owner-freebsd-stable  Sat May  5 16:50:41 2001
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Date: Sat, 5 May 2001 17:53:20 -0600 (Mountain Daylight Time)
From: Charlie Watts <cewatts@frontier.net>
To: Jan Mikkelsen <janm@transactionware.com>
Cc: Doug Russell <drussell@saturn-tech.com>,
	Matt Dillon <dillon@earth.backplane.com>,
	freebsd-stable <freebsd-stable@FreeBSD.ORG>
Subject: Re: soft update should be default
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On Sun, 6 May 2001, Jan Mikkelsen wrote:
> Good write speed is possible without using write cache by using tagged
> command queueing.  Have you measured tagged command queueing vs. write cache
> for write speed on your SCSI drives?  I get about the same (~23MB/sec) on an
> IBM DLTA-307030 Ultra ATA drive (tags/no WC vs. no tags/WC).  With neither
> option, it is terrible, of course.

I see the same behaviour on one of those disks, too. But - aren't IBM's
DTLA-series disks the only IDE drives that support TCQ?

[ It's a -very- SCSI-feeling feature, in my mind. ]


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