Date: Mon, 14 Sep 1998 19:22:52 -0700 From: David Greenman <dg@root.com> To: Terry Lambert <tlambert@primenet.com> Cc: joelh@gnu.org, tom@uniserve.com, gpalmer@FreeBSD.ORG, irc@cooltime.simplenet.com, freebsd-current@FreeBSD.ORG Subject: Re: Download of FreeBSD 3.0-SNAP Message-ID: <199809150222.TAA23732@implode.root.com> In-Reply-To: Your message of "Tue, 15 Sep 1998 01:56:16 -0000." <199809150156.SAA12652@usr05.primenet.com>
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>> >Note that David points out that FreeBSD *does* do elevator sorting; >> >it's still not optimal, however, since physical and logical cylinder >> >boundaries are infrequently the same on modern hardware. >> >> FreeBSD's disksort function sorts by block number, not by cylinder number. > >Hence it being non-optimal; see Mike's post... optimial is "always does >exactly the right thing". It's not pessimal, either (as Mike pointed >out, too). Uh, I think it is reasonable to assume that disk drives have contiguous block numbers (except for replacement blocks of course). Sorting by block number is the most optimal way of sorting that we can do in FreeBSD. -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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