Date: Sat, 14 Aug 1999 06:50:08 +0900 From: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> To: alc@cs.rice.edu Cc: rgrimes@gndrsh.aac.dev.com, cvs-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/vm vm_page.h Message-ID: <14260.37648.315208.25254T@ett.sat.t.u-tokyo.ac.jp> In-Reply-To: In your message of "Fri, 13 Aug 1999 15:33:31 -0500" <19990813153331.C26372@nonpc.cs.rice.edu> References: <199908122116.OAA56955@freefall.freebsd.org> <199908131458.HAA01346@gndrsh.aac.dev.com> <19990813140128.C27982@cs.rice.edu> <14260.30905.562825.38243A@ett.sat.t.u-tokyo.ac.jp> <19990813153331.C26372@nonpc.cs.rice.edu>
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At Fri, 13 Aug 1999 15:33:31 -0500, Alan Cox <alc@cs.rice.edu> wrote: > > On Sat, Aug 14, 1999 at 04:57:45AM +0900, Hidetoshi Shimokawa wrote: > > ... > > > > As for 21164 Alpha, it has 96KB 3-way L2 cache. > > So it needs only 4 (= 96KB / 8KB / 3) colors. > > > > My Alpha box has 4MB direct-map L3 cache and > > it needs 4MB / 8KB = 512 colors. I have the following entries in my > > vm_page.h > > > > I am afraid that the current implementation of page coloring doesn't > scale very well to such a large number of colors, especially if you > don't have an extremely large amount of physical memory. Far too often, It could be. Last time I checked, 256 colors gives best user-time while kernel-build benchmark. My machine is with 512MB physical memory. > it's unable to allocate a page of the appropriate color. Even with > just 8 colors on a machine with 320MB of physical memory, the number > of times that coloring fails during a "make world" is extraordinary. How do you detect 'coloring failure'? By adding counter in vm_page_list_find? > Bruce Evans and I are looking into this...if someone with an Alpha > has time to help out that could be useful. At least, alpha lacks pre-zeroed pages because vm_page_zero_idle is not enabled... -- /\ Hidetoshi Shimokawa \/ simokawa@sat.t.u-tokyo.ac.jp PGP public key: finger -l simokawa@sat.t.u-tokyo.ac.jp To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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