Date: Wed, 9 Jun 1999 14:28:51 -0300 (ADT) From: The Hermit Hacker <scrappy@hub.org> To: freebsd-current@freebsd.org Cc: freebsd-stable@freebsd.org Subject: MMAP() in STABLE/CURRENT ... Message-ID: <Pine.BSF.4.05.9906091422000.49155-100000@thelab.hub.org>
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Over the past week and a bit, the INN -CURRENT source tree had a major
upheaval of code, in order to fix the major problem where reader speed
sucked. What used to take >1min to load up a newsgruop now generally
takes mere seconds (no exaggeration, try it)...
The problem is that the new code makes *heavy* use of MMAP() ...
When the code was put in place, I immediately upgraded my server to give
the code a good test (am one of the developers over there) in a production
environment, and ever since then, my system locks up around 24hrs uptime,
requiring a cold boot.
I cannot get into DDB, since I'm over a serial console, so debugging this
has proved to be next to impossible :(
After discussing this with a few other FreeBSD'rs who have seen similar
problems, the point got brought up that it was believed there was still a
problem with our MMAP() implementation ... basically where it could still
cause a race condition to be generated ...
Since this problem is crucial to the stability of my server, as well as
anyone that keeps up on INN, I'm curious as to whether or not there are
any known problems with MMAP(), and, if so...what can I do to help rectify
the problem?
I run CURRENT at home and STABLE in production, but the production server
is the only one that I believe has enough load on her to be able to
trigger it...
Is this a problem that is fixed in CURRENT, but hasn't migrated down into
STABLE? Is there any way of adding some sort of debug code to STABLE such
that if the race condition is trigger, it will at least pop up a message
onto the console letting me know its happened so that I know its MMAP()
related?
Thanks...
Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org
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