Could be that midway through a Linux boot all code is sequential, but at
a later point Linux tries to initialize its timing facilities.  This
involves linux spinning on the timebase register which forces systemsim
to simulate many, many useless cycles.   Beyond that Linux
initialization sees a lot of cache initialization which requires memory
zeroing, which also is not simulator friendly.

I see this sort of behavior simply by running linux on the simulator wit
or without a hypervisor.

On Thu, 2007-01-04 at 18:19 -0600, Hollis Blanchard wrote:
> On Thu, 2007-01-04 at 16:48 -0700, Yoder Stuart-B08248 wrote:
> > Whad'ya know...if you wait long enough it works!
> So simulator performance is acceptable until mid-way through dom0 boot?
> It would be good to figure out the source of the slowdown.
Michal Ostrowski <[EMAIL PROTECTED]>

Xen-ppc-devel mailing list

Reply via email to