Messages in this thread | | | Date | Mon, 04 Dec 2017 13:08:18 +0100 | From | Oleksandr Natalenko <> | Subject | Re: i8k_smm_func() takes enormous of time to execute |
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Hi.
04.12.2017 11:35, Pali Rohár wrote: > On Friday 24 November 2017 13:28:59 Oleksandr Natalenko wrote: >> On pátek 24. listopadu 2017 12:25:43 CET Pali Rohár wrote: >> > On Friday 24 November 2017 12:17:30 Oleksandr Natalenko wrote: >> > > > There are two patches waiting to be tested in >> > > > https://bugzilla.kernel.org/show_bug.cgi?id=195751 >> > > >> > > Tested and attached a couple of patches on top of those to the BZ. If >> > > disabling fan control is the only approach here, I can confirm that this >> > > works. >> > >> > Hi! Please figure out which SMM call (they are identified by eax and ebx >> > registers) cause this freeze. So we would now what needs to be >> > blacklisted. >> >> Here it goes: >> >> [ 7.191081] dell_smm_hwmon: smm(0x10a3 0x0000) = 0x002e (took 1837 >> usecs) >> [ 7.194007] dell_smm_hwmon: smm(0x00a3 0x0001) = 0xffff (took 151 >> usecs) >> [ 7.198239] dell_smm_hwmon: smm(0x00a3 0x0000) = 0x0002 (took 1411 >> usecs) >> [ 7.199095] dell_smm_hwmon: smm(0x02a3 0x0001) = 0xffff (took 71 >> usecs) >> [ 7.700493] dell_smm_hwmon: smm(0x02a3 0x0000) = 0x157c (took 488912 >> usecs) >> [ 7.701277] dell_smm_hwmon: smm(0x0025 0X0000) = 0xffff (took 71 >> usecs) >> >> 0x02a3 is I8K_SMM_GET_SPEED. > > Ok, so it is really a good idea to disable fan control completely on > your machine.
This still doesn't explain why things work in non-Linux environment… But as a workaround, okay, let it be.
> Your last patch in bugzilla looks ok, you add my Reviewed-by: Pali > Rohár <pali.rohar@gmail.com>
Could you please advice on how to proceed further? I can submit all 3 patches (incl. yours two), to a ML.
Thanks.
Oleksandr
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