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SubjectRe: 2.6.9-rc2 and Hyperthreading. (SMT)
hotdog day wrote:
> I have been testing the 2.6.9-rc1, and 2.6.9-rc2 kernel patches over
> the past couple days and have been having some issues with
> hyperthreading (SMT) turned on.
>
> This problem first exhibited itself when I was testing
> 2.6.9-rc2-mm2-love2. I noticed the following quirks that ONLY show
> themselves with hyperthreading enabled on my 3.0C Pentium 4.
>
> Random HARD LOCKS. No messages from the kernel. Just a good swift hard lock.
>
> Hard locks when mounting two cdrom drives in quick succession.
>
> Turning off hyperthreading solves these issues. Going back to 2.6.8.1
> solves these issues.
>
> I then tried 2.6.9-rc1 with no mm or love patches. I had the exact same issues.
>
> Today I downloaded the prepatch to 2.6.9-rc2 and applied it to clean
> 2.6.8 source. The issues are still there.
>
> I hope someone is paying attention to the way scheduler tweaks and
> changes are affecting SMT enabled kernels. I don't think anyone wants
> to disable features of their hardware in order to run an optimized
> scheduler.

Try turning off CONFIG_SCHED_SMT and see how you go. Thanks.
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