Subject: Re: UBC usage-balancing code is checked in.
To: Chuck Silvers <email@example.com>
From: Lennart Augustsson <firstname.lastname@example.org>
Date: 03/12/2001 00:22:38
Could you make the freetarg and freemin variables tunable ass wel, please?
Chuck Silvers wrote:
> hi folks,
> the memory usage-balancing code that I posted about a while back
> is in -current now. here's the log message:
> add UBC memory-usage balancing. we track the number of pages in use for
> each of the basic types (anonymous data, executable image, cached files)
> and prevent the pagedaemon from reusing a given page if that would reduce
> the count of that type of page below a sysctl-setable minimum threshold.
> the thresholds are controlled via three new sysctl tunables:
> vm.anonmin, vm.vnodemin, and vm.vtextmin. these tunables are the
> percentages of pageable memory reserved for each usage, and we do not allow
> the sum of the minimums to be more than 95% so that there's always some
> memory that can be reused.
> this should fix a lot of the interactive performance problems that people
> have been reporting. hopefully the default settings for the new sysctl
> tunables will be reasonable for everyone, but I'm sure the enterprising
> among us will want to experiment. if anyone finds that things are
> much better with different settings, please post about it.
> as usual, let me know (or use send-pr) if there are any problems.