Re: [Linux-ia64] Pre-emption patch for IA-64

[Mario Smarduch <cms063@email.mot.com>]

So it appears like drivers are having issues and that's
to be expected if they're not reentrant. But what about
the kernel proper, has anyone observed issues there or
knows of any outstanding issues?

    - Mario.


Peter Chubb wrote:

> >>>>> "Jesse" = Jesse Barnes <jbarnes@sgi.com> writes:
>
> Jesse> Just FYI, I tried 2.5.64 out on my Bug Sur, and it seems to work ok
> Jesse> with the following exceptions:
> Jesse> o the AT keyboard support seems broken (characters are slow to show
> Jesse> up on the screen and are sometimes repeated)
> Jesse> o agp support for 460GX causes a link failure
>
> AT keyboard and PS/2 mouse both!
>
> Jesse> But by using a USB keyboard and turning off agp support, I was able to
> Jesse> get an SMP+preempt kernel going, and it seems fine.
>
> On a dual McKinley prototype machine I was able to get lockups with
> preempt under heavy I/O and cpu load (e.g., make -j4 in glibc).  I'm
> waiting for production model McKinleys SMP to retry, as I couldn't
> reproduce the problem on production-model Itanium 1, and there were no
> symptoms that I could debug.
>
> Also FYI, if you're using posix threads in userland, the port of the
> next generation library is almost complete, and, with the kernel
> preemption patch, will give much lower latencies for heavily threaded
> code, depending on exactly what you're doing.
>
> --
> Dr Peter Chubb                              peterc@gelato.unsw.edu.au
> You are lost in a maze of BitKeeper repositories, all almost the same.
>
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