Messages in this thread | | | From | Darren Williams <> | Date | Wed, 15 Sep 2004 11:11:14 +1000 | Subject | Re: 2.6.9-rc2 and Hyperthreading. (SMT) |
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On Tue, 14 Sep 2004, hotdog day wrote:
> Does anyone have any other suggestions on this issue? I know others > who are experincing the same thing. > > > On Tue, 14 Sep 2004 00:40:57 -0500, hotdog day <hotdogday@gmail.com> wrote: > > Actually, it just hardlocked again. Is there anything else that could > > be done, or am I stuck without SMP? > > > > > > > > > > On Mon, 13 Sep 2004 23:21:05 -0500, hotdog day <hotdogday@gmail.com> wrote: > > > Turning off CONFIG_SCHED_SMT has apparently fixed the issue. > > > > > > Three Q's: > > > > > > 1) Am I taking some kind of performance hit by doing this? > > > > > > 2) Is this something we can look forward to seeing fixed? > > > > > > 3) Do you need any info from me to help you? > > > > > > Thanks, > > > > > > Troy McFerron > > > > > > > > > > > > > > > On Tue, 14 Sep 2004 12:07:00 +1000, Nick Piggin <nickpiggin@yahoo.com.au> wrote: > > > > > > > > > > > > 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. I have tested 2.6.9-rc2 on a 3.0 Ghz HT and all seams OK, results of LTP message, and meminfo at: http://quasar.cse.unsw.edu.au/~dsw/public-files/x86
Not extensive though no lockups and left running overnight.
> > > > > > > > > > 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. I'll try this tonight.
> > > > > > > > > > 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. > > > > > > > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -------------------------------------------------- Darren Williams <dsw AT gelato.unsw.edu.au> Gelato@UNSW <www.gelato.unsw.edu.au> -------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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