On 26 July 2010 14:45, Gilles Chanteperdrix < [email protected]> wrote:
> Stephen Bryant wrote: > > Do you mean enabling / disabling the individual options in the SMI > > Workaround section of the kernel config file, or are you suggesting > > something lower level / something else? > > The options in the SMI workaround section of the kernel config file > actually disable some bits in some SMI registers, so they are already > low level. Anyway, yes, it is what I ask you to do. > > > -- > Gilles. > I've been looking into this when I've had the time and the results so far are that: - Globally disabling SMI fails. - Disabling all 8 'non-global' SMI options succeeds, but does not change my latency results. >From this I conclude that 'Globally disable SMI' really does try to disable every SMI signal, which is different from just deselecting each of the 8 'Enable ... SMI' options presented, which I had not realised. Also, my problem may still be SMI related, and I can only test this if I can convince the BIOS to allow global SMI disabling. So my next steps are to: 1 - Look for ways to change or circumvent the BIOS (if possible). 2 - Try a few other kernel settings (for examples the timers available) to find out if my issue stems from something other than SMIs. 3 - Progressively change the Xenomai SMI disabling code to test SMIs not covered by the 8 options presented. I'll be checking the literature for help with these, but if anyone has any pointers that would be much appreciated, Steve
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