lkml.org 
[lkml]   [2004]   [Sep]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: 2.6.9-rc2 and Hyperthreading. (SMT)
    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.
    > > > >
    > > > > 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/

    \
     
     \ /
      Last update: 2005-03-22 14:06    [W:0.023 / U:91.868 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site