Re: [PATCH] intel_ips: quieten "power or thermal limit exceeded" messages

Cesar Eduardo Barros
2010-08-27T23:12:22Z

Em 27-08-2010 04:39, Joe Perches escreveu:
> On Thu, 2010-08-26 at 22:38 -0300, Cesar Eduardo Barros wrote:
>> intel ips 0000:00:1f.6: CPU power limit 3863 exceeded: 0
>>
>> I think you put the parameters in the wrong order on the dev_info() call
>> for the CPU power limit; it is the limit that is 0.
>
> Yes. Fixed.
>
>> Two bogus things I can see:
>>
>> - The first "MCP power limit exceeded" seems very bogus.
>> - What do you mean, core_power_limit is zero?
>
> I added a logging message whenever the turbo limits change
> and logging messages for power/temp on MCH for completeness.
>
> Maybe this will show something useful like when/how
> CPU power limit gets set to 0.

Running with it right now, did not help much:

$ dmesg | fgrep 'intel ips'
intel ips 0000:00:1f.6: Warning: CPU TDP doesn't match expected value
(found 25, expected 35)
intel ips 0000:00:1f.6: PCI INT C -> GSI 18 (level, low) -> IRQ 18
intel ips 0000:00:1f.6: IPS driver initialized, MCP temp limit 65535
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: cpu:8058 +
mch:23392829
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5675
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 6369
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: cpu:5095 + mch:65379
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 7387
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 8326
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5943
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 6428
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5775
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 7061
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5153
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5098
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5208
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 7500
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 9144
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 6722
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 7156
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: cpu:5693 + mch:64598
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5856
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4209
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4726
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5259
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5212
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4862
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5281
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4235
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4897
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5257
intel ips 0000:00:1f.6: MCP power limit 65535 exceeded: cpu:5111 + mch:64134
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4843
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4909
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5904
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 6059
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5579
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5970
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 5213
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 6388
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4444
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 6545
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4439
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4682
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4337
intel ips 0000:00:1f.6: CPU power limit 0 exceeded: 4499

Just for fun, here is what debugfs has to say:

$ ls /sys/kernel/debug/ips/
cpu_clamp cpu_power cpu_temp mch_power mch_temp
$ cat /sys/kernel/debug/ips/*
23.0W 21.0A
4415mW
46.99
59670mW
0.00

All numbers except the last vary a lot. A few more examples:

21.0W 21.0A
4379mW
51.09
6493mW
0.00

23.0W 21.0A
4681mW
45.13
34062mW
0.00

--
Cesar Eduardo Barros
cesarb@cesarb.net
cesar.barros@gmail.com