Date: Mon, 21 Apr 2003 03:49:32 -0700 From: David Schultz <das@freebsd.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-current@freebsd.org Subject: Re: Broken memory management on system with no swap Message-ID: <20030421104932.GA3658@HAL9000.homeunix.com> In-Reply-To: <200304201924.h3KJOxWo090302@apollo.backplane.com> References: <000501c30682$4e5e64b0$6601a8c0@VAIO650> <20030420002940.GB46590@HAL9000.homeunix.com> <20030420191744.G19683@gamplex.bde.org> <20030420101401.GA2821@HAL9000.homeunix.com> <200304201828.h3KISlKq090099@apollo.backplane.com> <20030420191029.GA4803@HAL9000.homeunix.com> <200304201924.h3KJOxWo090302@apollo.backplane.com>
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On Sun, Apr 20, 2003, Matthew Dillon wrote: > note (1): normally act_count protects against thrashing. It is the > active queue's act_count algorithm which gives FreeBSD's such a nice > smooth degredation curve when memory loads become extreme by preventing > a frequently accessed page from being freed too early, so we don't > want to just turn it off. Maybe we need a test for 'too many active > pages', aka when > 80% of available pages are in the active queue > to temporarily disable the act_count test. Another possibility is to increase act_count's decay constant ACT_DECLINE in proportion to the size of the active queue. However, I don't know whether six bits would provide enough resolution for this strategy to have any advantage over your proposal.
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