Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

On my debian-linux system, with a core i7 920 , each time I resume after the command "pm-suspend" (suspend to RAM), mutlithreading capabilities almost disappear. More specifically, two distinct programs can use 2 distinct cores at full rate, but a single program is limited to only one core (for one instance of a multithreaded program as well as multiple instances of a monothreaded program, e.g. "make -j 4" for gcc). So I end up rebooting the system. Any help appreciated!

share|improve this question

Having the same pain in the butt with this bug on i7, so maybe I should switch to something more up-to-date than debian-stable. This is the first problem after several months of running the distro, so I think it's still not that much worth the effort though. More details than linked before available here: https://bugzilla.kernel.org/show_bug.cgi?id=15559


UPD: oh, and there's a workaround which seems to bring some of my cores back to life:

/sys/devices/system/cpu# for AA in `seq 2 1 7` ; do echo "0" > cpu$AA/online ; done;
/sys/devices/system/cpu# for AA in `seq 2 1 7` ; do echo "1" > cpu$AA/online ; done;
share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .