[EMAIL PROTECTED] wrote:
> We started losing performance with the idle page clearing so
> I've disabled it and haven't done much with it in quite a while. The code
> has fallen into disrepair and some has been removed in the latest
> versions. I'd suggest looking at the early 2.3.x and 2.2.1[23] series of
> Linux kernels. That's where it was doing its best.
Thanks. I'll get that version.
> How do you keep track of what parts of a page are used? In Linux I was
> just pulling pages off the free-list and zero-ing them. Do you have a
> bitmap of used regions within pages on BSD?
My mistake. FreeBSD zeroes the whole page as well. I traced through the
code incorrectly.
> I wanted a few bits for each page to describe its state: zero'd,
> non-zero'd, busy being zero'd. It would have taken some changes to the
> non-arch Linux code to do that and at the time we were moving to a more
> stable tree so I didn't continue with it. It sounds as though you have a
> framework for doing that sort of thing (and more) with BSD. Can you send
> me a pointer to the sources you're using? I'd like to look into it.
I'm running FreeBSD-stable right now, though I may switch to -current if I
get promising results, to make it easier to merge. (There is a web
interface to the FreeBSD CVS tree at
http://www.freebsd.org/support.html#cvs).
FYI, I'm interest in this for my thesis, which consists of two parts: (1)
utilizing idle resources (cpu, memory, disk/network I/O, disk/memory space)
for non-interfering background processing (i.e. run processes/threads using
*only* idle capacities); and (2) to use that mechanism for speculative
techniques.
Lars
--
Lars Eggert <[EMAIL PROTECTED]> Information Sciences Institute
http://www.isi.edu/larse/ University of Southern California
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