Cisco Systems UCSCPCIEBTG, 57712 manual 206

BIOS Parameters by Server Model

Advanced BIOS Parameters for C220 and C240 Servers

Name	Description
Adjacent Cache Line Prefetcher	Whether the processor fetches cache lines in even/odd pairs
	instead of fetching just the required line. This can be one of the
	following:
	• Disabled—The processor only fetches the required line.
	• Enabled— The processor fetches both the required line
	and its paired line.
DCU Streamer Prefetch	Whether the processor uses the DCU IP Prefetch mechanism to
	analyze historical cache access patterns and preload the most
	relevant lines in the L1 cache. This can be one of the following:
	• Disabled—The processor does not try to anticipate cache
	read requirements and only fetches explicitly requested
	lines.
	• Enabled—The DCU prefetcher analyzes the cache read
	pattern and prefetches the next line in the cache if it
	determines that it may be needed.
DCU IP Prefetcher	Whether the processor uses the DCU IP Prefetch mechanism to
	analyze historical cache access patterns and preload the most
	relevant lines in the L1 cache. This can be one of the following:
	• Disabled—The processor does not preload any cache data.
	• Enabled—The DCU IP prefetcher preloads the L1 cache
	with the data it determines to be the most relevant.
Direct Cache Access Support	Allows processors to increase I/O performance by placing data
	from I/O devices directly into the processor cache. This setting
	helps to reduce cache misses. This can be one of the following:
	• Disabled—Data from I/O devices is not placed directly
	into the processor cache.
	• Enabled—Data from I/O devices is placed directly into
	the processor cache.

	Cisco UCS C-Series Servers Integrated Management Controller CLI Configuration Guide, Release 1.5
206	OL-28893-01