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latency issues with ga-j1900n

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06 Nov 2018 22:04 #120122 by Todd Zuercher
Replied by Todd Zuercher on topic latency issues with ga-j1900n
I certainly wouldn't isolate 3 of 4 cores on a j1900. I might try 1 or 2 of them just for comparison. And it often pays to try isolating different cores or combinations of them. (The i5 i'm playing with right now gives best results with isolcpues=3.) But depending on the setup you have it may not even be worth the effort.

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06 Nov 2018 23:09 #120126 by jamby
Replied by jamby on topic latency issues with ga-j1900n
Todd and rodw

I let the last one run for a lot longer and also ran a latency-test -1ms. Results below:





During both of these I was ssh'd into the box and using apt-get, 7 glxgears, and ncftp to transfer files for my machine to linuxcnc/configs/
so the numbers are not as good.

thanks
Jim
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06 Nov 2018 23:18 #120127 by PCW
Replied by PCW on topic latency issues with ga-j1900n
oops 2 ms latency on a 1 ms thread is nogo

Is it possible you have some power management option still enabled or a bad harddrive?

I dont think I've seen that bad on anything other than laptops

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07 Nov 2018 15:50 - 07 Nov 2018 15:54 #120176 by jamby
Replied by jamby on topic latency issues with ga-j1900n
PCW

Here's two screenshots one after 3hrs the second after 15hrs





these were done as shown with no other actions, such as the ssh connection and apt-get execution during them.

Thanks
Jim
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Last edit: 07 Nov 2018 15:54 by jamby. Reason: include the pictures

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07 Nov 2018 17:40 #120188 by PCW
Replied by PCW on topic latency issues with ga-j1900n
Still nearly 1000000 ns latency
I still suspect you have a power management option (say C states >C1 enabled) enabled in the BIOS or bad hardware (bad drives can do this)

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08 Nov 2018 12:04 #120250 by andypugh
Replied by andypugh on topic latency issues with ga-j1900n
Is there any chance this is SMI?

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08 Nov 2018 14:48 - 08 Nov 2018 14:50 #120268 by jamby
Replied by jamby on topic latency issues with ga-j1900n
PCW andypugh

The key was PCW's C states C1, that was the first time I found out that value was power related.

Now here's the latest histograph



Looks good enough for me. So its Wheezy for me.

Thanks
Jim
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Last edit: 08 Nov 2018 14:50 by jamby. Reason: spelling correction

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27 Sep 2019 11:52 #146371 by yili.yin
Replied by yili.yin on topic latency issues with ga-j1900n
hi dm17ry

If the i915 drive is necessary, is there any other way to reduce the latency peak?

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27 Sep 2019 13:24 #146381 by Todd Zuercher
Replied by Todd Zuercher on topic latency issues with ga-j1900n
isolcpus=2,3 helps on the J1900 machine that I have. (I have <10000ns using that)

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27 Sep 2019 13:32 #146382 by taloot
Replied by taloot on topic latency issues with ga-j1900n
make sure you use compatible memory. also check the memory voltage form bios. this make a lot of different

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