On 11/14/2012 03:19 PM, EBo wrote:
> On Nov 14 2012 2:16 PM, John Morris wrote:
>> Hi Kent,
>>
>> On 11/14/2012 12:58 PM, Kent A. Reed wrote:
>> > On 11/14/2012 1:34 PM, John Morris wrote:
>> >> - NVidia GeForce 6100 chipset
>> >> - A suspicious 'model unknown' AMD Athlon 64-bit single core
>> 2.2GHz
>> >> 1MB cache I got super cheap in Beijing 2007
>> >> - 8GB DDR2 RAM, I believe 800MHz
>> >> - ATI Radeon X1300 Pro video card running two monitors
>> >
>>> Then did you really mean "ms" as in milliseconds? 7ms/6ms is 3
>>> orders of magnitude greater than the jitter I'm seeing on my Athlon
>>> II X64 640 and I have a hard time believing the different cpus are
>>> 1000x different in performance.
>>
>> Ha, Andy caught me before using the wrong units several months back,
>> but
>> I seem to have let down my guard again. Yes, 7us/6us.
>
> I was wondering about that. Thanks for the clarification. 7us/6us
> seems really good to me.
Just tested on the i686 in the shop, where the numbers looked pretty
bad. The base numbers looked like 13us/10us, but spikes quickly brought
those up to 100-200us. There's still tuning to be done, such as turning
the SMI workaround kernel options on.
As I keep saying, my goal is to lower the barrier to entry for novice
users. I predict that a big challenge in making LinuxCNC more
accessible will be inability to provide a single kernel image that works
for everyone. The SMI workarounds are an example: these should not be
turned on for all machines, but on ones with jitter spikes but no
SMI-related risk of overheating, these should be turned on. Maybe this
will change in the future if a run-time switch is implemented, but for
now it's a problem.
John
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