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<p>Neeraj,</p>
<p>Thanks for the inputs. It's nice to see us having a similar
thought.</p>
<p>AFAIK, we don't have any work-group that is driving <span
style="color:windowtext">“Platform telemetry and health
monitoring”. Also, do we want to see this as 2 different
entities ?. In the past, there were thoughts about using
websockets to channel some of the thermal parameters as
telemetry data. But then it was not implemented.</span></p>
<p><span style="color:windowtext">We can discuss here I think.</span></p>
<p><span style="color:windowtext">!! Vishwa !!<br>
</span></p>
<div class="moz-cite-prefix">On 5/17/19 12:00 PM, Neeraj Ladkani
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:windowtext">At cloud
scale, telemetry and health monitoring is very critical. We
should define a framework that allows platform owners to add
their own telemetry hooks. Telemetry service should be
designed to make this data accessible and store in resilient
way (like blackbox during plane crash). <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Is there any
workgroup that drives this feature “Platform telemetry and
health monitoring” ?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Wishlist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">BMC
telemetry : <o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level1
lfo5">
Linux subsystem<o:p></o:p></li>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Uptime<o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
CPU Load average<o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Memory info<o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Storage usage ( RW ) <o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Dmesg<o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Syslog <o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
FDs of critical processes <o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Alignment traps <o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
WDT excursions <o:p></o:p></li>
</ol>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level1
lfo5">
IPMI subsystem<o:p></o:p></li>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Request and Response logging par interface with timestamps
( KCS, LAN, USB)<o:p></o:p></li>
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level2
lfo5">
Request and Response of IPMB<o:p></o:p></li>
</ol>
</ol>
<p class="MsoListParagraph"
style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l7
level3 lfo5">
<!--[if !supportLists]--><span style="color:windowtext"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>i.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="color:windowtext">Request , Response, No of Retries<o:p></o:p></span></p>
<ol style="margin-top:0in" start="3" type="1">
<li class="MsoListParagraph"
style="color:windowtext;margin-left:0in;mso-list:l7 level1
lfo5">
Misc<o:p></o:p></li>
</ol>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph"
style="color:windowtext;mso-list:l2 level1 lfo8">Critical
Temperature Excursions
<o:p></o:p></li>
</ol>
<p class="MsoListParagraph"
style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l7
level3 lfo5">
<!--[if !supportLists]--><span style="color:windowtext"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>i.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="color:windowtext">Minimum Reading of Sensor<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l7
level3 lfo5">
<!--[if !supportLists]--><span style="color:windowtext"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>ii.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="color:windowtext">Max Reading of a sensor<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l7
level3 lfo5">
<!--[if !supportLists]--><span style="color:windowtext"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>iii.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="color:windowtext">Count of state transition<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:-9.0pt;mso-list:l7
level3 lfo5">
<!--[if !supportLists]--><span style="color:windowtext"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>iv.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="color:windowtext">Retry Count<o:p></o:p></span></p>
<ol style="margin-top:0in" start="2" type="a">
<li class="MsoListParagraph" style="mso-list:l2 level1 lfo8">Count
of assertions/deassertions of GPIO and ability to capture
the state<o:p></o:p></li>
<li class="MsoListParagraph" style="mso-list:l2 level1 lfo8">timestamp
of last assertion/deassertion of GPIO<o:p></o:p></li>
</ol>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">~Neeraj<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span
style="color:windowtext"> openbmc
<a class="moz-txt-link-rfc2396E" href="mailto:openbmc-bounces+neladk=microsoft.com@lists.ozlabs.org"><openbmc-bounces+neladk=microsoft.com@lists.ozlabs.org></a>
<b>On Behalf Of </b>vishwa<br>
<b>Sent:</b> Wednesday, May 8, 2019 1:11 AM<br>
<b>To:</b> Kun Yi <a class="moz-txt-link-rfc2396E" href="mailto:kunyi@google.com"><kunyi@google.com></a>; OpenBMC
Maillist <a class="moz-txt-link-rfc2396E" href="mailto:openbmc@lists.ozlabs.org"><openbmc@lists.ozlabs.org></a><br>
<b>Subject:</b> Re: BMC health metrics (again!)<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hello Kun,<o:p></o:p></p>
<p>Thanks for initiating it. I liked the /proc parsing. On the
IPMI thing, is it only targeted to IPMI -or- a generic
BMC-Host communication kink ?<o:p></o:p></p>
<p>Some of the things in my wish-list are:<o:p></o:p></p>
<p>1/. Flash wear and tear detection and the threshold to be a
config option<br>
2/. Any SoC specific health checks ( If that is exposed )<br>
3/. Mechanism to detect spurious interrupts on any HW link<br>
4/. Some kind of check to see if there will be any I2C lock to
a given end device<br>
5/. Ability to detect errors on HW links<o:p></o:p></p>
<p>On the watchdog(8) area, I was just thinking these:<o:p></o:p></p>
<p>How about having some kind of BMC_health D-Bus properties
-or- a compile time feed, whose values can be fed into a
configuration file than watchdog using the default
/etc/watchdog.conf always. If the properties are coming from a
D-Bus, then we could either append to /etc/watchdog.conf -or-
treat those values only as the config file that can be given
to watchdog.<br>
The systemd service files to be setup accordingly.<o:p></o:p></p>
<p><br>
We have seen instances where we get an error that is
indicating no resources available. Those could be file
descriptors / socket descriptors etc. A way to plug this into
watchdog as part of test binary that checks for this ? We
could hook a repair-binary to take the action.<o:p></o:p></p>
<p><br>
Another thing that I was looking at hooking into watchdog is
the test to see the file system usage as defined by the
policy.<br>
Policy could mention the file system mounts and also the
threshold.<br>
<br>
For example, /tmp , /root etc.. We could again hook a repair
binary to do some cleanup if needed<br>
<br>
If we see the list is growing with these custom requirements,
then probably does not make sense to pollute the watchdog(2)
but<br>
have these consumed into the app instead ?<o:p></o:p></p>
<p>!! Vishwa !!<o:p></o:p></p>
<div>
<p class="MsoNormal">On 4/9/19 9:55 PM, Kun Yi wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<div>
<p class="MsoNormal">Hello there,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">This topic has been brought up
several times on the mailing list and offline, but
in general seems we as a community didn't reach a
consensus on what things would be the most valuable
to monitor, and how to monitor them. While it seems
a general purposed monitoring infrastructure for
OpenBMC is a hard problem, I have some simple ideas
that I hope can provide immediate and direct
benefits.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">1. Monitoring host IPMI link
reliability (host side)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The essentials I want are "IPMI
commands sent" and "IPMI commands succeeded" counts
over time. More metrics like response time would
be helpful as well. The issue to address here: when
some IPMI sensor readings are flaky, it would be
really helpful to tell from IPMI command stats to
determine whether it is a hardware issue, or IPMI
issue. Moreover, it would be a very useful
regression test metric for rolling out new BMC
software.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Looking at the host IPMI side,
there is some metrics exposed
through /proc/ipmi/0/si_stats if ipmi_si driver is
used, but I haven't dug into whether it contains
information mapping to the interrupts. Time to read
the source code I guess.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Another idea would be to
instrument caller libraries like the interfaces in
ipmitool, though I feel that approach is harder due
to fragmentation of IPMI libraries.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">2. Read and expose core BMC
performance metrics from procfs<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">This is straightforward: have a
smallish daemon (or bmc-state-manager) read,parse,
and process procfs and put values on D-Bus. Core
metrics I'm interested in getting through this way:
load average, memory, disk used/available, net
stats... The values can then simply be exported as
IPMI sensors or Redfish resource properties.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">A nice byproduct of this effort
would be a procfs parsing library. Since different
platforms would probably have different monitoring
requirements and procfs output format has no
standard, I'm thinking the user would just provide a
configuration file containing list of (procfs path,
property regex, D-Bus property name), and the
compile-time generated code to provide an object for
each property. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">All of this is merely thoughts
and nothing concrete. With that said, it would be
really great if you could provide some feedback such
as "I want this, but I really need that feature", or
let me know it's all implemented already :)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If this seems valuable, after
gathering more feedback of feature requirements, I'm
going to turn them into design docs and upload for
review.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">Regards, <o:p></o:p></p>
<div>
<p class="MsoNormal">Kun<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
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