Pete Carah wrote:
Kris writes:
You and anyone else seeing performance problems should try to work
through the advice given here:
> http://people.freebsd.org/~kris/scaling/Help_my_system_is_slow.pdf
<http://people.freebsd.org/%7Ekris/scaling/Help_my_system_is_slow.pdf>
Well, all the people in this thread have noticed that WITH NO CONFIG CHANGES
from configs
that worked fine in the past, their systems are very slow and/or locking up (mine are both) with
the stable branch sometime (I noticed it sometime in December, but it got worse with the release.)
Most were OK in October; mine (I think) were OK in late November - may narrow things down? Two of my
systems that lock up have no internal visibility when they do (Soekris 4801's routing; the only
time-intensive things running are routing (done in irq context) and pflog.
These run with 60+
meg ram free.) These are complete lockups, though I did manage to get a ps out of my laptop last
night by waiting 20 _minutes_ for it to start (!). This is not a generic performance problem. The laptop
had 55 minutes of cpu time in the softdepflush thread after being up about an
hour and 10 mins;
this might give a hint. I didn't spot LL/RL state threads at the same time
because I didn't know
to. Now I do. BTW - the same ps showed 8 or so user-space procs in R state
with NO cpu time; the
kernel was hogging all of it for over an hour.
Firefox did indeed trigger this one as someone else noted. A soekris doing
only routing+nat has no such
excuse... At least PHK was nice enough to note the watchdog in another thread
:-)
Actually, there have been several apparently different problems reported
in this thread, some of which (including the message I replied to) *are*
generic "my system is slower" problems.
For generic "my system hangs" problems, see the chapter on kernel
debugging in the handbook or follow the (same) advice given by Robert
earlier in the thread.
Kris
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