Advice on component selection.
07 Jan 2015 04:31 #54687
by NeoTech
Replied by NeoTech on topic Advice on component selection.
Ah cool now i know how to read that thing at least.
And yeah, then i have alot of crap i need to strip out of this installation .=)
Im still experimenting with GUI's and modifying the installation.
And yeah, then i have alot of crap i need to strip out of this installation .=)
Im still experimenting with GUI's and modifying the installation.
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07 Jan 2015 04:39 #54688
by andypugh
Replied by andypugh on topic Advice on component selection.
Try cd /usr/realtime-2.6.32-122-rtai/testsuite/kern/latency/ then ./run and see if there is a periodicity to the high latency values. If it happens at regular (64 seconds, for example) intervals then suspect SMI.
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07 Jan 2015 04:39 #54689
by PCW
Replied by PCW on topic Advice on component selection.
First thing to do to improve latency is turn off _all_ power management/ and speed switching options in the BIOS
Then if your CPU supports hyperthreading, turn it off also
Then if your CPU supports hyperthreading, turn it off also
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07 Jan 2015 04:49 #54690
by NeoTech
Replied by NeoTech on topic Advice on component selection.
Ah well dont know if that test suit exists on my build.. i used Wheezy in the bottom, installed a realtime kernen from repository then compiled from source.. so for some reason i got 2.8.x something, maybe could be an issue i guess?
Power management is always off - i deactivate all that crap in every puter i own on bios level.. =)
But, why should i turn off hyperthreading, guessing that would help out with calculations - not that a Core i5 processor support hyperthreading, but have 4 cores at least.
Power management is always off - i deactivate all that crap in every puter i own on bios level.. =)
But, why should i turn off hyperthreading, guessing that would help out with calculations - not that a Core i5 processor support hyperthreading, but have 4 cores at least.
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07 Jan 2015 04:51 #54691
by andypugh
Probably not, but you ought to have the equivalent for your kernel.
Replied by andypugh on topic Advice on component selection.
Ah well dont know if that test suit exists on my build.
Probably not, but you ought to have the equivalent for your kernel.
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07 Jan 2015 04:57 #54692
by NeoTech
Replied by NeoTech on topic Advice on component selection.
I shall investigate. =)
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07 Jan 2015 05:39 #54695
by PCW
Replied by PCW on topic Advice on component selection.
Not sure why but hyperthreading is a known latency poison, its _always_ better when off
I guess only 2 core I5s have hyperthreading
I guess only 2 core I5s have hyperthreading
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07 Jan 2015 05:41 #54697
by NeoTech
Ah right, you are talking about the mobile processors like Core i5m - those that use hyperthreading to emulate 4 cores, and are marketed as 4 cores.
Replied by NeoTech on topic Advice on component selection.
I guess only 2 core I5s have hyperthreading
Ah right, you are talking about the mobile processors like Core i5m - those that use hyperthreading to emulate 4 cores, and are marketed as 4 cores.
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08 Jan 2015 08:13 #54734
by NeoTech
Replied by NeoTech on topic Advice on component selection.
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08 Jan 2015 08:27 #54736
by PCW
Replied by PCW on topic Advice on component selection.
In my experience running flash videos on youtube is about the worst RT torture test
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