Date: Sun, 7 Feb 1999 01:15:07 -0500 (EST) From: "John S. Dyson" <dyson@iquest.net> To: current@FreeBSD.ORG Subject: Significant page coloring improvement Message-ID: <199902070615.BAA00269@y.dyson.net>
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--ELM918368107-256-0_ Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit When reviewing the VM code regarding another issue (another significant VM contributor had found an interesting anomoly), I noticed that the coloring wasn't as complete as it should be. Attached is a patch that appears to make a reasonable improvement in performance, when using both my slightly more advanced VM kernel, and also the stuff in -current. I seem to see a fork() only performance improvement of about 10% on a 2 processor SMP PPro, using lmbench. On vfork (which isn't completely implemented on a PPro, but is still faster than fork), the improvement appears to be about 5%. Of course, any page coloring improvement is dependent on alot of factors, but the missing object coloring handling is a problem... -- John | Never try to teach a pig to sing, dyson@iquest.net | it makes one look stupid jdyson@nc.com | and it irritates the pig. --ELM918368107-256-0_ Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: attachment; filename=vm.diff Content-Description: vm.diff Content-Transfer-Encoding: 7bit Index: vm/vm_object.c =================================================================== RCS file: /local/home/ncvs/src/sys/vm/vm_object.c,v retrieving revision 1.144 diff -r1.144 vm_object.c 215a216 > kmem_object->pg_color = (kernel_object->pg_color + PQ_L2_SIZE/4) & PQ_L2_MASK; 945a947 > result->pg_color = (source->pg_color + OFF_TO_IDX(*offset)) & PQ_L2_MASK; --ELM918368107-256-0_-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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