Re: [uml-user] UML too slow.

[Jeff D. <jd...@ad...>]

fma...@fe... said:
> when we raised an image without passing the parameter "mem =" it goes
> very speed, but at the moment in which we indicated the parameter
> "mem=256M" or more, the starting of that UML is slowest, reason why we
> did not raise the more when seeing the slowness of this one.

This sounds like highmem is getting involved.  Highmem is particularly
slow in skas mode because, unlike in tt mode, UML has no direct access
to highmem mapped into a process.  So, on every copy_user, it has to
kmap the page in order to access it.

				Jeff