Date: Sun, 5 Nov 2000 17:57:46 +0100 From: Bernd Walter <ticso@cicely8.cicely.de> To: David Greenman <dg@root.com> Cc: janb@cs.utep.edu, freebsd-current@FreeBSD.ORG Subject: Re: current paging strategy Message-ID: <20001105175745.A42346@cicely8.cicely.de> In-Reply-To: <200011020845.AAA13439@implode.root.com>; from dg@root.com on Thu, Nov 02, 2000 at 12:45:30AM -0800 References: <Pine.GSO.4.05.10011012354110.21637-100000@gecko> <200011020845.AAA13439@implode.root.com>
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On Thu, Nov 02, 2000 at 12:45:30AM -0800, David Greenman wrote: > >Interesting. THis needs about two bytes per page for the counter? > > Actually, we found that a single byte per page was sufficient. Pages tended > to be either heavily accessed or rarely accessed. Even in the unusual case > where all pages are frequently accessed, the page reclaim rate (and thus > adjustment rate of the page references count) increases high enough to still > provide for a decent distribution of the counters and for the page LOU to be > effective. One byte sounds good for i386. Maybe it makes sense to have it 4 or 8 byte on risc platforms. I wonder if it's a critical path and if there are more of this in the kernel source. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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