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x86 systems can show performance issues and hangs (Doc ID 2088354.1)

Last updated on FEBRUARY 04, 2019

Applies to:

Solaris Operating System - Version 10 1/13 U11 to 11.2 [Release 10.0 to 11.0]
Oracle Solaris on x86-64 (64-bit)

Symptoms

This issue can occuron the x86/x64 platform:

x86 systems with Xeon CPUs can be affected by performance issues and process hangs related to the deep C state power saving mechanisms. Symptoms are

  1. Runable processes are assigned to a CPU. They were put on a CPU's dispatch queue, but they will not be executed.
  2. The CPU is in the current_cstate 3.
  3. The CPU is running the idle thread with priority -1, though it has threads with a higher priority in its run or dispatch queue.

On a live system or in a crash dump you could for example see that a process is runnable , but it was not put on the CPU:

 

Cause

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In this Document
Symptoms
Cause
Solution
References


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