About Hardware Prefetchers
Hardware prefetchers work well in workloads that traverse array and other regular data
structures. The hardware prefetcher option is disabled by default and should be disabled when
running applications that perform aggressive software prefetching or for workloads with
limited cache. For example, memory-intensive applications with high bus utilization could see a
performance degradation if hardware prefetching is enabled.
Service Procedures
This section contains the following service procedure topics:
■
“How to Clear the CMOS” on page 88
■
“Updating BIOS and SP Firmware” on page 89
■
“Recovering the SP and BIOS Firmware” on page 91
▼
How to Clear the CMOS
Use this procedure to clear the server’s CMOS settings in the case of a system hang.
For example, if the server hangs because of incorrect settings and will not boot, use this
procedure to invalidate the settings and reboot with the default settings.
Prepare the server for service. See
“How to Prepare for Service”on page 21.
Remove the AC power cord from the rear of the server.
Remove the server cover. See
“How to Remove the Server Cover”on page 25.
Remove the battery for 30 seconds, then reinsert it.
Use the procedure for replacing the system battery. See
“Replacing the System Battery (CRU)”
on page 31
.
Install the server cover. See
“How to Install the Server Cover”on page 26.
Prepare the server for operation. See
“How to Prepare for Operation”on page 26.
Reinsert the AC power cord.
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About Hardware Prefetchers
Sun Fire X2270 M2 Server Service Manual • January, 2012, –1288
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