[Bug 109051] intel_idle.max_cstate=1 required on baytrail to prevent crashes

[Robert Small]

As requested.

# cstateInfo.sh
cpu0 State  Name     Disabled  Latency  Residency         Time     Usage
         0  POLL            0        0          0       320349     23243
         1  C1-BYT          0        1          1  35018930703  14858769
         2  C6N-BYT         1      300        275       225138       319
         3  C6S-BYT         1      500        560      1517455       999
         4  C7-BYT          0     1200       4000  34965703628   6557188
         5  C7S-BYT         0    10000      20000   6707737452    564406
cpu1 State  Name     Disabled  Latency  Residency         Time     Usage
         0  POLL            0        0          0       144668     14927
         1  C1-BYT          0        1          1  15728639117   4710264
         2  C6N-BYT         1      300        275       114082       172
         3  C6S-BYT         1      500        560      1410496       624
         4  C7-BYT          0     1200       4000  50011254628   7988000
         5  C7S-BYT         0    10000      20000  13239825298    605157
cpu2 State  Name     Disabled  Latency  Residency         Time     Usage
         0  POLL            0        0          0       781399     31216
         1  C1-BYT          0        1          1  14661348811   2820901
         2  C6N-BYT         1      300        275       293099       423
         3  C6S-BYT         1      500        560      1615360      1021
         4  C7-BYT          0     1200       4000  12125826131   1639244
         5  C7S-BYT         0    10000      20000  22839073312    728724
cpu3 State  Name     Disabled  Latency  Residency         Time     Usage
         0  POLL            0        0          0      1046058     33476
         1  C1-BYT          0        1          1  18025094795   3457563
         2  C6N-BYT         1      300        275       321547       584
         3  C6S-BYT         1      500        560      1689307       896
         4  C7-BYT          0     1200       4000  12417037473   1725348
         5  C7S-BYT         0    10000      20000  20938233703    922453
# uptime
 23:04:17 up 1 day, 1 min,  4 users,  load average: 1.15, 1.04, 1.01


Thanks,


*Robert Small*
 e: Robert at RobertSmall.org

On 21 September 2016 at 09:23, Robert Small <robert at robertsmall.org> wrote:

> Sending from my phone outside school gates so I'm not able to get all the
> details. However, previously on 4.5.7 where I don't need the cstates
> parameter at all I've found it to be significantly cooler and by manually
> checking and trying to remember it seemed to be lower power usage
> (powertop).
>
> Incidentally, those commandline parameters were what was needed to drop
> the cstates parameter from the commandline with 4.5.7. Not sure how many
> are needed now.
>
> Another possibility is that some of these crashes are software not kernel.
> I went from stable to testing yesterday and everything kept crashing. I
> upgraded to unstable which has proven to be stable to the same level as
> stable. Also, I noticed one crash which recovered itself.
>
> Thanks,
> Robert.
>
> On Wed, 21 Sep 2016, 8:40 a.m. Nicolas Huillard, <nicolas at huillard.net>
> wrote:
>
>> Le mardi 20 septembre 2016 à 20:19 +0100, Robert Small a écrit :
>> > Not only can I confirm that this works it makes sound stable on
>> 4.7.3.10!
>>
>> Great info, thank you Robert !
>>
>> > cpu0 State  Name     Disabled  Latency  Residency       Time   Usage
>> >          0  POLL            0        0          0     139827     655
>> >          1  C1-BYT          0        1          1  278968871  443703
>> >          2  C6N-BYT         1      300        275     529818     620
>> >          3  C6S-BYT         1      500        560    1498249    1034
>> >          4  C7-BYT          0     1200       4000   42598904   11160
>> >          5  C7S-BYT         0    10000      20000    5278866     421
>> ...
>>
>> I suppose you can confirm that C6* time and usage doesn't change after
>> starting the script. C7* are not used that much, but that's probably
>> because you got this snapshot shortly after boot/tests.
>>
>> > cat /proc/cmdline
>> > BOOT_IMAGE=/boot/vmlinuz-4.7.3.10 root=/dev/mapper/vgDrudwyn-root64 ro
>> > i915.modeset=1 threadirqs intel_iommu=igfx_off clocksource=tsc
>> tsc=reliable
>> > sdhci.debug_quirks=0x10000 quiet splash
>>
>> Wow... That's a lot of parameters... I'll check mine when I can.
>>
>> What about battery life or device temperature when you leave it alone
>> (it's a bit warm when I leave it alone without C7*) ?
>>
>> --
>> NH
>>
>> _______________________________________________
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>> click at tinc-vpn.org
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>
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