SMP

See the original letter here.

The SMP case seems to have something wrong with it. My MARCH=p4 and -O optimized kernel often crashes when shutting down on beastieng.frontfree.net. Apparantly this is lock related (we can see the panic strings there not to be outputing atomically, and they just mixed with each other).

Robert today has sent a headsup to current@, claiming that he will merge his changes on p4 to cvs soon.

Profiling based optimization means better performance.

Here’s phk’s suggestion:

We can compile our kernel with "--test-coverage --profile-arcs" to
do basic-block profiling (see kernbb(8) and gcov(1)/gcc(1) docs.)

I have sent a headsup to bugs list of DragonflyBSD, which mentions the recent bugfixes on FreeBSD-CURRENT committed by Dr. Alan Cox.

As planned, Jeff Roberson has made ULE scheduler the default for FreeBSD’s CVS -HEAD. This is an important step going forward to 5-STABLE.