I have made a patchset available for both -current and -stable on my site:
This patchset contains debugging code for the pageout daemon which can be
turned on with:
sysctl -w vm.debug_pageout_stats=1
The debugging code prints a line to dmesg and /var/log/messages each
time the pageout daemon runs a scan, and tells you how many clean pages,
dirty pages, and skipped pages were scanned, as well as the calculated
page deficit for the invalid queue scan and the active queue scan.
This output would be invaluable to me coming from people who still have
major performance problems on heavily loaded machines.
I would appreciate wide testing, especially by anyone running heavily
loaded -stable boxes. I am especially interested in how this patchset
performs on news boxes.
Pleae keep in mind that -current is unstable at the moment and that the
instability has nothing to do with this or other VM/low-memory related
(Paul, I'm cc'ing you to see if you could run those heavy-load tests
with this patchset. My tests showed a remarkable improvement in response
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