Cache Base 512K-640K; Cache Extended Memory; Discrete Mtrr Allocation; Pcie Configuration - Silicon Graphics Altix XE250 User Manual

5: BIOS Settings

Cache Base 512K-640K

Cache Extended Memory

Discrete MTRR Allocation

PCIe Configuration

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directly from the buffer without writing data to the system memory in order to speed up CPU's
operation. The options are Uncached, Write Through, Write Protect, and Write Back.
If enabled, this feature will allow the data stored in the memory area: 512K-640K to be cached
(written) into a buffer, a storage area in the SDRAM or written into L1, L2, or L3 cache inside the
CPU to speed up CPU operations. Select Uncached to disable this function. Select Write Through
to allow data to be cached into the buffer and written into the system memory at the same time.
Select Write Protect to prevent data from being written into the base memory area of Block
512-640K. Select Write Back to allow the CPU to write data back directly from the buffer without
writing data to the system memory to speed up CPU's operation. The options are Uncached, Write
Through, Write Protect, and Write Back.
If enabled, this feature will allow the data stored in the extended memory area to be cached
(written) into a buffer, a storage area in the Static DROM (SDROM), or written into L1, L2, or L3
cache inside the CPU to speed up CPU's operations. Select Uncached to disable this function.
Select Write Through to allow data to be cached into the buffer and written into the system
memory at the same time. Select Write Protect to prevent data from being written into the base
memory area of Block 0-512K. Select Write Back to allow the CPU to write data back directly
from the buffer without writing data to the system memory to speed up CPU's operation. The
options are Uncached, Write Through, Write Protect and Write Back.
If enabled, MTRRs (Memory Type Range Registers) are configured as distinct, separate units and
cannot be overlapped. If enabled, the user can achieve better graphic effects when using a Linux
graphic driver that requires the write combining configuration with 4GB or more memory. The
options are Enabled and Disabled.
Access the submenu to make changes to the following settings for PCIe devices.
007-5467-001