Hardware Memory Dump - Hitachi Compute Blade 2000 User Manual

 How to check frequencies
Compare the following values, which are output in "/proc/interrupts", to check
whether or not the APIC timer can detect correct frequency.
(1) Number of the global timer interrupts: total amount of each CPU
(2) Number of the local timer interrupts for CPU0
When frequencies of the APIC timer are detected correctly, values of (1) and (2) are
almost the same. If detected incorrectly, values of (1) and (2) are extremely different.
How to check whether or not a detected frequency is correct is described by showing
correct and incorrect examples:
If frequencies of the APIC timer are detected incorrectly, stop the system
immediately and apply the preventive measure.

Correctly detected
# grep -e CPU -e timer -e LOC /proc/interrupts
CPU0
0: 52343376
LOC: 209325542 209325558 209318927 209318950
(1) 209338158 = 52343376 + 52341770 + 52317862 + 52335150

(2) 209325542

 Incorrectly detected
# grep -e CPU -e timer -e LOC /proc/interrupts
CPU0
0: 22188646
LOC: 44361775
(1) 88748664 = 22188646 + 22187456 + 22187286 + 22185276

(2) 44361775


Hardware memory dump

Hardware Memory Dump is a system-embedded functionality to get memory dump.
It is supported by X57A1, X55A1 (*) and X55A2 models of Compute Blade 2000
server blades.
(*) EFI version 03-xx/04-xx needs to be installed on the X55A1 model to use the
Hardware Memory Dump.
If Hardware Memory Dump is enabled and properly configured, you can get memory
dump even in case that memory dump operation by kdump, which is a dump
functionality provided by the OS, fails.
CPU1 CPU2
52341770 52317862 52335150
CPU1 CPU2
22187456 22187286 22185276
44366256 44361703 44366179
1777
CPU3
IO-APIC-edge timer
CPU3
IO-APIC-edge timer