>>>>> "Paolo" == Paolo Bonzini <pbonz...@redhat.com> writes:
Paolo> Il 14/06/2012 04:29, Peter Crosthwaite ha scritto: >> Obviously this sucks as a patch, but without this hack, the system >> freezes on boot. I managed to ascertain that its coming from the >> ptimer used by the system timer (hw/xilinx_timer.c). The CPU is >> either halted and never resumes, or the timer is flooding with halt >> requests and the CPU never gets another look in. >> >> The question is, is this a failure in ptimer, xilinx_timer or the >> async framework? Can ptimer be misused such that the CPU is locked >> up? Paolo> Yes, this looks like the ptimer is flooding the iothread so Paolo> that the CPU does not get an occasion to run. Paolo> Perhaps you want to limit the rate of the hw/xilinx_timer.c to Paolo> something like 1000 Hz or something like that. Changeset cf36b31db209a261ee3bc2737e788e1ced0a1bec Limit ptimer rate to something achievable is meant to fix this in the cases where the timer is auto-reloaded. xilinx_timer.c always uses the timer in one-shot mode, so it needs to be fixed in there. -- Dr Peter Chubb peter.chubb AT nicta.com.au http://www.ssrg.nicta.com.au Software Systems Research Group/NICTA
