Date: Sun, 26 Jul 1998 13:37:03 +0200 From: Andreas Klemm <andreas@klemm.gtn.com> To: dg@root.com Cc: Brian Feldman <green@zone.baldcom.net>, freebsd-current@FreeBSD.ORG Subject: Re: New LINT options: what is VM coloring? Message-ID: <19980726133703.A27677@klemm.gtn.com> In-Reply-To: <199807261020.DAA07327@implode.root.com>; from David Greenman on Sun, Jul 26, 1998 at 03:20:23AM -0700 References: <19980726112401.A5570@klemm.gtn.com> <199807261020.DAA07327@implode.root.com>
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On Sun, Jul 26, 1998 at 03:20:23AM -0700, David Greenman wrote: > >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. Ok, thanks ! -- Andreas Klemm http://www.FreeBSD.ORG/~andreas What gives you 90% more speed, for example, in kernel compilation ? http://www.FreeBSD.ORG/~fsmp/SMP/akgraph-a/graph1.html "NT = Not Today" (Maggie Biggs) ``powered by FreeBSD SMP'' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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