Re: [2.4.17/18pre] VM and swap - it's really unusable

yodaiken
2002-01-21T17:16:04Z

On Mon, Jan 21, 2002 at 06:12:58PM +0100, Peter Wächtler wrote:
> > Since the preemption patch only allows additional preemption in kernel
> > mode, I'm curious to know what the compute bound tasks are doing in
> > kernel mode. Did Linux add in-kernel matrix multiplication while
> > I was not looking?
> >
>
> Dead right you are.
> Then there are only slow system calls left. Umh, execve(), fork()
> (with big address space) - what about page_launder etc.?

Those are, in some sense, I/O right? It's not clear to me
that preempting page_launder is sensible.

> But what is a possible explanation for the people, who think their
> systems behave better with preemption - strong believe?

Beats me. Maybe it really does work - but maybe not and nobody
has advanced any analysis or numbers that make the case.

--
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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com