Date: 13 Feb 2001 01:36:36 +0100 From: Dag-Erling Smorgrav <des@ofug.org> To: Jordan Hubbard <jkh@winston.osd.bsdi.com> Cc: Greg Lehey <grog@lemis.com>, Danny Braniss <danny@cs.huji.ac.il>, Matt Dillon <dillon@earth.backplane.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: soft updates performance Message-ID: <xzpu25zo1uz.fsf@flood.ping.uio.no> In-Reply-To: Jordan Hubbard's message of "Mon, 12 Feb 2001 16:31:06 -0800" References: <79800.982024266@winston.osd.bsdi.com>
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Jordan Hubbard <jkh@winston.osd.bsdi.com> writes: > > More likely RAM bandwidth. Those 133 Mhz FSBs ought to help, though. > If RAM bandwidth was the bottleneck here then putting /usr/src and > /usr/obj into an MFS would have represented a pessimization over > simply leaving that on disk. Don't be so sure. Stuff on disk has to be read into memory, and this is generally done by DMAing it off the disk, which locks the memroy bus, then copying it out into userland. With an MFS you skip the first part, unless MFS is stupider than I thought. 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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