Re: Dragonfly under KVM

[Gary Allan <dragonfly@xxxxxxxxxxxx>]

Matthew Dillon wrote:
>     I think I see what may be happening here, and I am starting to wonder
>     if it is also the cause of the system lockups I am getting when testing
>     HAMMER under extreme loads (with hundreds of user threads which are
>     sometimes cpu-bound).
>
>     I think it may be deadlocking between lwkt_acquire() and lwkt_schedule().
>     The thread trying to migrate between cpu's is getting stuck and the 
>     acquisition loop is not processing incoming IPIs while it is waiting for
>     the thread to deschedule on the other cpu.
>
>     Please try this patch.
>
> 					-Matt
> 					Matthew Dillon 
> 					<dillon@backplane.com>

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