Re: Dragonfly under KVM

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

:Hello,
:
:I've applied the patch and left the system running a "make -j8 
:buildworld" in a loop, cleaning out /usr/obj between each run.
:
:It has been running for over 10 hours with no lock-ups with each build 
:taking ~45mins. I have also tested -j32 while taxing the disk and CPU of 
:the Linux host OS.
:
:All now appears to be Ok.
:
:Thanks
:
:Gary

    The patch also appears to fix the system lockups I was experiencing
    testing HAMMER.  My worst-case stress test ran over the weekend without
    any problems.

    The two things in common here are that both KVM and HAMMER (under stress)
    could impose very long latencies on particular cpus, creating a
    deadlock between the IPI sending code and the thread cpu-migration
    code.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>