Date: Mon, 14 Sep 1998 02:17:01 -0700 (PDT) From: dan@math.berkeley.edu (Dan Strick) To: dg@root.com Cc: dan@math.berkeley.edu, freebsd-current@FreeBSD.ORG Subject: Re: Download of FreeBSD 3.0-SNAP Message-ID: <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. Dan Strick dan@math.berkeley.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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