<div dir="ltr">Hi Daniel, <div><br></div><div><br></div><div>thanks a lot for your reply, but AFAIK we do not power off completely in case of checkstop i.e there is still risk of damage. Am I wrong? </div><div><br></div><div>regards,</div><div>Sergey </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 31, 2018 at 1:36 AM, Daniel M Crowell <span dir="ltr"><<a href="mailto:dcrowell@us.ibm.com" target="_blank">dcrowell@us.ibm.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font size="2" face="sans-serif">From one of our power/thermal management
folks - </font><br><font size="2" face="sans-serif">HTMGT/OCC does not power off due to
CPU overtemp it was always stated that the system would checkstop due to
thermal runaway before causing damage. We would rather let it checkstop
in that real case vs. shutting systems down due to a bad DTS reading. The
BMC can decide to do a shutdown based on the CPU temperatures that they
get from the OCC, I know in P9 the OpenBMC did add this I don't recall
if AMI BMC did this in P8.</font><br><font size="2" face="sans-serif"><br>--<br>Dan Crowell<br>Senior Software Engineer - Power Systems Enablement Firmware<br>IBM Rochester<br><a href="mailto:dcrowell@us.ibm.com" target="_blank">dcrowell@us.ibm.com</a></font><br><br><br><br><font size="1" color="#5f5f5f" face="sans-serif">From:
</font><font size="1" face="sans-serif">Sergey Kachkin <<a href="mailto:s.kachkin@gmail.com" target="_blank">s.kachkin@gmail.com</a>></font><br><font size="1" color="#5f5f5f" face="sans-serif">To:
</font><font size="1" face="sans-serif"><a href="mailto:openpower-firmware@lists.ozlabs.org" target="_blank">openpower-firmware@lists.<wbr>ozlabs.org</a></font><br><font size="1" color="#5f5f5f" face="sans-serif">Date:
</font><font size="1" face="sans-serif">05/25/2018 07:54 AM</font><br><font size="1" color="#5f5f5f" face="sans-serif">Subject:
</font><font size="1" face="sans-serif">[OpenPower-Firmware]
P8 overtemp behavior</font><br><font size="1" color="#5f5f5f" face="sans-serif">Sent by:
</font><font size="1" face="sans-serif">"OpenPower-Firmware"
<openpower-firmware-bounces+<wbr>dcrowell=<a href="mailto:us.ibm.com@lists.ozlabs.org" target="_blank">us.ibm.com@lists.<wbr>ozlabs.org</a>></font><br><hr noshade><div><div class="h5"><br><br><br><font size="3">Hi Team, </font><br><br><font size="3">I've got a question regarding a P8 overtemp behavior.
After processors reach 85C (OPEN_POWER_PROC_DVFS_TEMP_<wbr>DEG_C) OCC
start frequency throttling. </font><br><font size="3"> I'm trying to figure out what would happen if temperature
continues to grow? (broken fan/ condition).</font><br><br><font size="3">POWER8 User manual says: "Automated hardware thermal
overtemperature protection is not supported. The real-time OCC firmware
accomplishes this function."</font><br><br><font size="3">Is there any emergency power off mechanism due to overtemp
on P8? </font><br><br><font size="3">thanks, </font><br><br><font size="3">regards,</font><br></div></div><font size="3">Sergey </font><tt><font size="2">_______________________<wbr>________________________<br>OpenPower-Firmware mailing list<br><a href="mailto:OpenPower-Firmware@lists.ozlabs.org" target="_blank">OpenPower-Firmware@lists.<wbr>ozlabs.org</a><br></font></tt><a href="https://lists.ozlabs.org/listinfo/openpower-firmware" target="_blank"><tt><font size="2">https://lists.ozlabs.org/<wbr>listinfo/openpower-firmware</font></tt></a><tt><font size="2"><br></font></tt><br><br><br></blockquote></div><br></div>