Messages in this thread | | | Date | Tue, 14 Sep 2004 12:07:00 +1000 | From | Nick Piggin <> | Subject | Re: 2.6.9-rc2 and Hyperthreading. (SMT) |
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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. - 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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