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70053
June 2nd, 2014 09:00
PE C6100 BD PROCHOT clocking down systems
Hello,
A client of mine has recently purchased 75 C6100s. Roughly 100 nodes are clocking down to 1.6GHz. They should be running at 2.8GHz as they are Xeon X5660s. Pre-production testing revealed the issue, they can run ThrottleStop 6.0 and un-check BD PROCHOT, this lets the system run at 2.8GHz. However it cannot be run in production. I am wondering if different HW revisions could cause this behavior, I know for a fact that they have 2 different chassis, and a number of different node revisions. I cannot find anything about the BD PROCHOT feature on any Dell servers. I get nothing but forum posts about home PCs.
The systems behave the same with 1400W power supplies installed, and BIOS at optimal defaults. Changing proc settings has no effect.
-Has anybody experienced this issue?
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DELL-Chris H
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June 2nd, 2014 13:00
JW,
There is indeed 2 different hardware revisions of the C6100. I don't believe that would cause the issue. The first thing I would look at is what the current BIOS and BMC/ESM revision are at. The get the system current to see if the issue is still occurring. Now if the revision you are at is 1.3 or earlier then don't just run the most current update as it can cause the system to fail to boot.
Let me know what the revisions are at for both and I can get the proper links if needed.
nickelob
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June 2nd, 2014 14:00
The BIOS, BMC, and FCB are updated to the latest versions per support.dell.com.
uwebb
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June 4th, 2014 06:00
Normally, the PROCHOT signal only goes active when a CPU is overheating and has reached the thermal throttling temperature set by Intel. This immediately forces the CPU to use the minimum multiplier so it runs at its slowest speed and lowest voltage so it can cool down.
BD PROCHOT stands for bi-directional processor hot. With bi-directional processor hot, other sensors on the motherboard can send a signal to the CPU which tricks the CPU into thinking it is too hot. This forces the CPU to run at its slowest speed just as if it was overheating.
If this is not a problem for all of the servers you recently purchased then it is probably just some bad motherboard temperature or power sensors that are sending this signal to your CPU. You would need to ask the engineers that designed your motherboard about what signals can trigger this type of CPU throttling.
ThrottleStop 7.00 beta 3 can access both CPUs and can be used to disable the BD PROCHOT signal path so your CPUs can run at their full Intel rated speed. Contact the author if you need that version. When BD PROCHOT is disabled, the CPUs will still be able to thermal throttle if they ever get too hot. Disabling BD PROCHOT only prevents other sensors outside the CPU from triggering throttling. If these are new motherboards then they are likely defective and should be replaced.
alexson
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January 16th, 2018 09:00
that would , yes stop sensors from sending the cpu down. YOU are one lucky person for the cpu still @1600 Mhzi
if you have i5 it can send clock to 400Mhz (4x~99mhz = ~396mhz)T
How is windows either 8 or 10 running on THAT
oh i guess if you went far enough windows xp could be ran on ~28 mhz 96 mb ram (9 minute boot time)