[PLUG] Re: debugging hyperthreading problems

[drew wymore]

Thanks for the ideas Wil .. will give it a shot :-)

On 10/12/06, Wil Cooley <wcooley at nakedape.cc> wrote:
>
> On Thu, 2006-10-12 at 10:53 -0700, drew wymore wrote:
> > Bringing this thread back to life. Still trying to figure this one out.
> I
> > have ruled out SSH as using Telnet causes the same behavior with the
> second
> > CPU enabled. However with both CPU's going and logging in locally the
> issue
> > doesn't happen. So its something with sockets/bash or some other
> weirdness
> > but I'm at a loss now. Someone at work suggested maybe a glibc problem
> but
> > I'm running a recent version that supports NPTL and bash is using those
> libs
> > and when I force standard linux thread libs it still has the same
> problem.
> >
> > Anyone ideas?
>
> Something funny is going on with interrupts, probably.
>
> o Have you tried a different NIC, preferably not on-board?
> o Have you tried pinging it, preferably more than the default 4 times
>    Windows ping does? You might find some odd variances in ping times
>    where there should be none.
> o If you can do a flood ping or otherwise send other traffic to the
>    host while making the connection and see if that causes it to not
>    happen--it sounds like a buffer somewhere isn't getting flushed as
>    often as expected and pumping data through might cause it to be
>    flushed.
> o Run Wireshark (nee Ethereal) while logging in and compare packet
>    timings, look for broken packets, etc.
> o Check /etc/profile, /etc/profile.d, /etc/bashrc to see if something
>    gets run or set on login.  You might temporarily enable tracing by
>    putting 'set -x' at the top of the /etc/profile and see if you can
>    pinpoint where it stops, if it actually stops.
>
> Wil
> --
> Wil Cooley <wcooley at nakedape.cc>
> http://nakedape.cc
>
>
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