Re: gettimeofday() non-monotonic on SMP kernel version 2.2.10

From: Samuel Thompson (samuelt@its.caltech.edu)
Date: Mon Jul 31 2000 - 18:44:40 EST


> This sounds almost exactly like the problems I was having when I
> used to have an SMP machine with different speed CPUs. Is this
> true here? Or are all of your processors running at the same
> speed?

All are the same speed, so this is likely not the problem.

> I wrote a couple of patches which are available at
> http://hypocrite.org/linux/ (the ...new... patch is most likely
> to help). These are against 2.3.99-pre if memory serves but
> should port easily to earlier kernels.
>
> Alternatively, try compiling and telling the kernel that you are
> using a 586-possibly-without-TSC which *may* help.

I ported and applied the patch... and it made the problem much much
worse. However, it helped to localize the problem to the TSC code. Perhaps
I will find a solution with this info.

Thanks for your help.

Sam

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