thermald does not consult /etc/default or command line for allowed temp. ranges. #9

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1. olajep commented on Mar 17, 2017

   

   olajep

   on Mar 17, 2017

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   parallella-thermald reads THERMALD_MAX_TEMP from the environment. It does not read from /etc/default/parallella-thermald by itself. It's the job of the init system. Service files for systemd and upstart are provided.

   If you want to start thermald with a different max temp from the command line you can do:

   $ THERMALD_MAX_TEMP=65 parallella-thermald
   

   I don't recommend changing the defaults, get a fan instead!

   // Ola
2. silvenshadow commented on Mar 23, 2017

   

   silvenshadow

   on Mar 23, 2017 via email

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   Ola, Okay, I think I found this bug. Feature? Behavior: root@cirrus:~# THERMALD_MAX_TEMP=75 /usr/sbin/parallella-thermald-dist Parallella thermal watchdog daemon starting... Ignoring THERMALD_MAX_TEMP value. Allowed temperature range [0 -- 70] C. Using /dev/epiphany/mesh0 Entering mainloop. ^CGot Interrupt Exiting normally These defines are set in thermald.c #define DEFAULT_MAX_TEMP 70 #define CRITICAL_MAX_TEMP 70 #define ENV_ALLOWED_MAX_TEMP CRITICAL_MAX_TEMP Then this if block: if (env_max <= ENV_ALLOWED_MAX_TEMP && ENV_ALLOWED_MIN_TEMP < env_max) wd->max_temp = env_max; So basically since the default max temp, and critical temp are the same, you can only lower the max temp with the environment, not raise it. The Zynq 7010 datasheet says the max for this chip is 85c. With the Parallella in the Adapteva case, running video, net, usb, epiphany, and both arm cores at 100% I stay far below this mark. (Stable at about 78c). For my workloads 75c is a good shutdown point. So is this a feature or a bug? :D zmc

   …

   On 03/17/2017 12:38 PM, Ola Jeppsson wrote: parallella-thermald reads THERMALD_MAX_TEMP from the environment. It does not read from /etc/default/parallella-thermald by itself. It's the job of the init system. Service files for systemd and upstart are provided. If you want to start thermald with a different max temp from the command line you can do: |$ THERMALD_MAX_TEMP=65 parallella-thermald | I don't recommend changing the defaults, get a fan instead! // Ola — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#9 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ATYmn2ZUQwOzlUtgsKDTyonlrgrRzqk8ks5rmrcDgaJpZM4MdKjF>.
3. olajep commented on Mar 25, 2017

   

   olajep

   on Mar 25, 2017

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   Ugh!!

   So is this a feature or a bug? :D
   It is a feature. The hard 70C limit might be a bit too conservative but better safe than sorry. 10,000 boards out there...

   The Paracase is supposed to stay below 70C, at least w/ the headless images.
   Did you follow the full assembly instructions?
   https://youtu.be/TTxCWS-MohA

   // Ola
4. silvenshadow commented on Apr 30, 2017

   

   silvenshadow

   on Apr 30, 2017

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   Sorry it's been a while, I can confirm that headless bitstreams, even ones including a riscv rocketchip core, with everything at full load stay below 70c. The hdmi-enabled bitstreams run significantly hotter, especially while playing video.

   I did follow all the assembly instructions for the case, I have an older board with the larger caps, and there is a bit of an issue if I tighten the mounting screws the board bends and creates instability (!).

   I'm not sure what the hardware differences are between the board revisions but perhaps the bigger heatsink creates better contact than the folded metal :D