Date: 13 Feb 2001 00:28:07 +0100 From: Dag-Erling Smorgrav <des@ofug.org> To: Greg Lehey <grog@lemis.com> Cc: Danny Braniss <danny@cs.huji.ac.il>, Matt Dillon <dillon@earth.backplane.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates performance Message-ID: <xzp3ddjpjlk.fsf@flood.ping.uio.no> In-Reply-To: Greg Lehey's message of "Tue, 13 Feb 2001 09:53:00 %2B1030" References: <E14RurO-0000Zl-00@cs.huji.ac.il> <xzp7l2wc6v6.fsf@flood.ping.uio.no> <20010213095300.D2178@wantadilla.lemis.com>
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Greg Lehey <grog@lemis.com> writes: > In fact, it's exactly the opposite. 'make world' is CPU-bound, so the > speed of the I/O system is irrelevant. If it were I/O bound, soft > updates *would* make a difference, because a number of unnecessary > writes would be eliminated. Read what he writes. Soft updates *did* make a difference - they shaved ~30% off his worldstone. It's parallelization that doesn't make a difference in his case, because his CPU and FSB are fast enough that the I/O system is left completely in the dust. This is a 900 MHz box, probably with a 100 MHz or 133 MHz FSB, not the old 486DX33 you have lying in a corner. DES -- Dag-Erling Smorgrav - des@ofug.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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