Date: Sun, 26 Jul 1998 03:20:23 -0700 From: David Greenman <dg@root.com> To: Andreas Klemm <andreas@klemm.gtn.com> Cc: Brian Feldman <green@zone.baldcom.net>, freebsd-current@FreeBSD.ORG Subject: Re: New LINT options: what is VM coloring? Message-ID: <199807261020.DAA07327@implode.root.com> In-Reply-To: Your message of "Sun, 26 Jul 1998 11:24:01 %2B0200." <19980726112401.A5570@klemm.gtn.com>
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>On Sat, Jul 25, 1998 at 05:10:54PM -0700, David Greenman wrote: >> Page coloring is the process of allocating pages that have physical >> alignment that provides optimal utilization of the memory cache. This can >> be a big win for direct-mapped caches (e.g. most Pentium L2 caches), but >> loses effectiveness with set-associative caches (e.g. Pentium Pro, which >> has a set size of 4). > >Do you think it would be better to turn PQ off using: > > options PQ_NOOPT # No coloring You mean in the Pentium Pro case? No, page coloring has basically no overhead and can only help - even with associative caches. I think the "PQ_NOOPT" option is only for performance comparison/testing. -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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