Date: Mon, 14 Sep 1998 10:22:02 -0700 From: David Greenman <dg@root.com> To: dan@math.berkeley.edu (Dan Strick) Cc: freebsd-current@FreeBSD.ORG Subject: Re: Download of FreeBSD 3.0-SNAP Message-ID: <199809141722.KAA16867@implode.root.com> In-Reply-To: Your message of "Mon, 14 Sep 1998 02:17:01 PDT." <199809140917.CAA09398@math.berkeley.edu>
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>> >FreeBSD no longer does elevator sorts on data pending output, >> >relying instead on the disk hardware to be smarter about this, >> >especially given the likelihood that the drive is lying about >> >its pysical geometry, making it unlikely that any sort you >> >could do would result in an optimization. > >Even so, the driver should sort the I/O requests whenever the >system's buffer queue for the drive exceeds the capacity of >the system/host-adapter/drive for concurrently active commands. >Since actual drive "geometry" is usually messy these days, >a simple minded sort by block number would be appropriate. For the record, the quote that you sited above was Terry's, not mine, and in any case doesn't match reality. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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