Date: Tue, 29 Dec 2009 23:29:55 -0600 (CST) From: Scott Bennett <bennett@cs.niu.edu> To: freebsd-questions@freebsd.org Subject: Re: questions about superpages Message-ID: <200912300529.nBU5TtoK022767@mp.cs.niu.edu>
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A short while ago, I wrote:
> I poked around in the stuff in /sys/i386/vm looking for the threshholds
That should have said, "/sys/vm", not what I wrote. Sorry for any
confusion.
>of process memory size for promotion to 4 MB pages and for demotion back to
>4 KB pages, but didn't see them. Can someone tell me what those threshholds
>are? I'm assuming there must be a larger threshhold for promotion than for
>demotion on the basis that hysteresis is necessary to keep the VM system
>continual oscillation of processes with memory requirements close to the
>promotion thresshold. If someone who knows can also point me toward the
>place that these values appear in the source code, I'd appreciate that, too.
> Thanks in advance!
Scott Bennett, Comm. ASMELG, CFIAG
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