Date: Wed, 25 Jul 2001 07:06:45 +0400 From: "Valeriy E. Ushakov" <uwe@ptc.spbu.ru> To: freebsd-stable@FreeBSD.ORG Subject: wc, tagging &c (not a troll ;) Message-ID: <20010725070644.A14953@snark.ptc.spbu.ru>
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In my box I have a Quantum drive and an IBM DTLA-307015 drive. The
latter supports tagged queuing, as ata(4) tells and from the
discussion(s) on this list my understanding is that tags are safe,
unlike write caching (since we sometimes have random power glitches, I
really don't want to turn wc on).
However code in ata-disk in ad_attach does
if (ata_wc || ata_tags)
turn on wc
if (ata_tags && ad_tagsupported(adp))
turn on tagging
This makes me nervous as at the first glance it looks like it will
enable wc on my quantum drive even though it doesn't do tagging.
Shouldn't it be:
do_tagging = ata_tags && ad_tagsupported(adp);
if (ata_wc || do_tagging)
turn on wc
if (ata_tags && do_tagging)
turn on tagging
Thanks.
SY, Uwe
--
uwe@ptc.spbu.ru | Zu Grunde kommen
http://www.ptc.spbu.ru/~uwe/ | Ist zu Grunde gehen
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