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

Re: Bug#758757: kfreebsd-10: d-i bugs caused by qemu-system-i386+kvm

Cyril Brulebois, le Thu 21 Aug 2014 02:03:48 +0200, a écrit :
> Steven Chamberlain <steven@pyro.eu.org> (2014-08-21):
> > On 21/08/14 00:23, Steven Chamberlain wrote:
> > > Using qemu-system-i386 with the -smp 2 flag, I started seeing weird
> > > issues early in d-i:
> > 
> > It seems more likely this was triggered by -enable-kvm (on a wheezy
> > linux-amd64 host).
> > 
> > Without that flag it looks reliable so far, even with -smp 2 (but I'm
> > worried it could be non-deterministic).
> While this might be a bug in the emulation layer indeed, another view
> would be that -enable-kvm means stuff go quicker and you might have
> higher chances of hitting race conditions.

Without -enable-kvm, one only gets software simulation, which exposes
extremely little concurrency indeed: there is no real concurrent
execution at all, and just periodic execution switch from one virtual
CPU to another.


Reply to: