Is this the type of kludges Linux should have in the kernel because a few people
want to run
configurations that Intel does not even support? In looking at the patch, every
call to
do_gettimeoffset() will now go through a procvar, instead of being called directly.
It's not
a significiant impact, but it is an impact none-the-less. ANY impact to support
this type
of configuration is too much (in my opinion). Some things belong off-stream. If
someone
is running this configuration, they should patch their own kernel to not impact the
rest of us.
Am I the only one to feel this way?
Mark
....wait a sec, as I put on flame-resistant clothing ;-)
Christopher Thompson wrote:
> If you have an SMP machine and have CPUs with different multipliers (i.e.
> different speeds), Linux does not work correctly, at least not if it uses TSC
> which is currently the case for Celerons (?) and better.
>
> I am attaching a patch against 2.3.99-pre6 which attempts to fix this. It is a
> PRELIMINARY patch which means I beg you to please send me some feedback. I
> really am out of my league here with kernel hacking (so please be gentle).
> However, the patch should detect the error condition and work around it, you
> don't have to configure anything (but remember to do make dep).
>
> Once the bugs are fixed and/or no bugs are found :), I'll send it along to the
> appropriate people.
>
> Please: I need this tested under the following environments:
> ABIT BP6-style Celeron SMP motherboard with same speed CPUs
> ABIT BP6-style Celeron SMP motherboard with different speed CPUs
> PPro or better SMP machine with same speed CPUs
> PPro or better SMP machine with different speed CPUs if such exists
> Athlon (for the sake of consistency)
> Cyrix CPU
> And last but not least, a PPro-or-better and a worse-than-PPro SINGLE CPU
> machine.
>
> If you have any of these, please try out the patch and let me know how you fair.
>
> The patch is my own work but with help from Alan Cox and this mailing list.
>
> --
> Christopher Thompson http://hypocrite.org/
> One Ring to rule them all, One Ring to find them,
> One Ring to bring them all and in the darkness bind them
> -- Fellowship of the Rings, movie, Christmas 2001
>
> ------------------------------------------------------------------------
> Name: tsc.patch
> tsc.patch Type: text/x-c
> Encoding: base64
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