From: Oleksandr Natalenko <oleksandr@natalenko.name>
To: "Pali Rohár" <pali.rohar@gmail.com>
Cc: Jean Delvare <jdelvare@suse.de>,
Jonathan Buzzard <jonathan@buzzard.org.uk>,
Guenter Roeck <linux@roeck-us.net>,
linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org,
Mario Limonciello <mario.limonciello@dell.com>
Subject: Re: i8k_smm_func() takes enormous of time to execute
Date: Mon, 04 Dec 2017 13:08:18 +0100 [thread overview]
Message-ID: <0cfe104c062adcd7cc35e0b94c5bfba1@natalenko.name> (raw)
In-Reply-To: <20171204103507.gymmjw46lzggzndo@pali>
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
next prev parent reply other threads:[~2017-12-04 12:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-23 21:41 i8k_smm_func() takes enormous of time to execute Oleksandr Natalenko
2017-11-24 10:22 ` Jean Delvare
2017-11-24 11:17 ` Oleksandr Natalenko
2017-11-24 11:25 ` Pali Rohár
2017-11-24 12:28 ` Oleksandr Natalenko
2017-12-04 10:35 ` Pali Rohár
2017-12-04 12:08 ` Oleksandr Natalenko [this message]
2017-12-04 12:18 ` Pali Rohár
2018-01-27 14:09 ` Pali Rohár
2018-01-27 16:07 ` Guenter Roeck
2017-11-24 11:13 ` Pali Rohár
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