Date: Sat, 2 Sep 2006 02:43:12 -0700 (PDT) From: "R. B. Riddick" <arne_woerner@yahoo.com> To: hardware@ee.ccny.cuny.edu, freebsd-fs@freebsd.org Subject: Re: ATA flush cache on sync() Message-ID: <20060902094312.18973.qmail@web30302.mail.mud.yahoo.com> In-Reply-To: <Pine.GSO.4.44.0609011439070.1078-100000@eesfc20.engr.ccny.cuny.edu>
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--- hardware@ee.ccny.cuny.edu wrote: > When the sync() system call is called on an ATA drive with a UFS 2 > filesystem, is the "FLUSH CACHE" ATA command sent to the drive? > As far as I know, when sync() return u cannot even be sure, that the in-kernel buffers are flushed already... And the "FLUSH CACHE" ATA command (or BIO_FLUSH since gjournal) is disputed, since it might break (in FBSD not implemented) concepts like TCQ(?) (tagged command queuing) or so... But I think there should be a FLUSH CACHE command from time to time, so that there cannot be an arbitrary gap... -Arne __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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