[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] Broken Microblaze timer

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Broken Microblaze timer
Date: Thu, 14 Jun 2012 11:19:56 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0

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?

Yes, this looks like the ptimer is flooding the iothread so that the CPU
does not get an occasion to run.

Perhaps you want to limit the rate of the hw/xilinx_timer.c to something
like 1000 Hz or something like that.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]