Mesa hm2/hm2_7i96s.0: error finishing read
16 Oct 2022 13:27 - 16 Oct 2022 13:30 #254218
by PCW
Replied by PCW on topic Mesa hm2/hm2_7i96s.0: error finishing read
How large is the latency spike?
What are your kernel command line parameters?
Are all power management options,speed switching/C states >C1 disabled in the BIOS?
(ms latencies are often related to power management/clock speed switching)
What are your kernel command line parameters?
Are all power management options,speed switching/C states >C1 disabled in the BIOS?
(ms latencies are often related to power management/clock speed switching)
Last edit: 16 Oct 2022 13:30 by PCW.
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16 Oct 2022 13:39 #254221
by bensttech
Replied by bensttech on topic Mesa hm2/hm2_7i96s.0: error finishing read
i will need to measure it again but its something in 1432312`s
i have tried combinations of "intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll" and also isolcpus=2,3. it seems system load does change the how periodicaly it happens. power management is off in the bios.
i have tried combinations of "intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll" and also isolcpus=2,3. it seems system load does change the how periodicaly it happens. power management is off in the bios.
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16 Oct 2022 14:57 #254231
by PCW
Replied by PCW on topic Mesa hm2/hm2_7i96s.0: error finishing read
That large of a latency spike is likely power management related
Are you sure all CPU frequency switching is disabled in the BIOS?
Are you sure all CPU frequency switching is disabled in the BIOS?
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16 Oct 2022 22:04 #254271
by bensttech
Replied by bensttech on topic Mesa hm2/hm2_7i96s.0: error finishing read
Yep double and tripple checked. Running normally the read.time is between 370k and 520k when it blips it goes to around 1.6M
I just booted up my other box deb10 cnc 2.8 and 4.19.0-17-rt-amd64 and its rock solid at about 500k ish. it is different hardware though so not really a fair test tomorrow i will try the exact hardware
I just booted up my other box deb10 cnc 2.8 and 4.19.0-17-rt-amd64 and its rock solid at about 500k ish. it is different hardware though so not really a fair test tomorrow i will try the exact hardware
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- snowgoer540
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16 Oct 2022 22:13 #254276
by snowgoer540
FWIW if you search the forum for J1900 you'll see people have mixed results with that processor. Some people swear by them, and others (myself included) couldn't get it to work reliably. Not saying that is your issue, but figured it was worth mentioning nonetheless.
Replied by snowgoer540 on topic Mesa hm2/hm2_7i96s.0: error finishing read
model name : Intel(R) Celeron(R) CPU J1900 @ 1.99GHz
FWIW if you search the forum for J1900 you'll see people have mixed results with that processor. Some people swear by them, and others (myself included) couldn't get it to work reliably. Not saying that is your issue, but figured it was worth mentioning nonetheless.
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16 Oct 2022 22:19 #254280
by bensttech
Replied by bensttech on topic Mesa hm2/hm2_7i96s.0: error finishing read
Thanks for the insight the strange thing is i have another machine same mainboard same FPGA card on 2.8 and its dead stable. i suspect its kernel driver related but it v frustrating
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16 Oct 2022 22:20 #254281
by PCW
Replied by PCW on topic Mesa hm2/hm2_7i96s.0: error finishing read
1.6M is close to 1 ms, you might try increasing the servo thread period to 1.5 or 2 ms
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16 Oct 2022 22:24 #254282
by bensttech
Replied by bensttech on topic Mesa hm2/hm2_7i96s.0: error finishing read
That would be a work around but i would like to get to the bottom of it as i know i have another machine running same mb and fpga card without issues on 2.8.
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16 Oct 2022 22:32 #254283
by bensttech
Replied by bensttech on topic Mesa hm2/hm2_7i96s.0: error finishing read
increasing the servo period to 1.5ms instantly made my worse case blip 2.4M, not exactly sure what that means.
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16 Oct 2022 22:53 #254288
by PCW
Replied by PCW on topic Mesa hm2/hm2_7i96s.0: error finishing read
it probably means that packets were being dropped (timed-out)
at a 1 ms servo thread rate (default timeout is 80% of servo period)
at a 1 ms servo thread rate (default timeout is 80% of servo period)
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