Cisco Headend Digital Broadband Delivery System Guía Del Usuario
6-14
Interactive Program Guide Options
4002178 Rev C
Adjust How Set-Tops Use IPG Memory,
Continued
Configure Memory Thresholds
SARA currently limits the amount of free memory that IPG data can consume. With
SARA currently limits the amount of free memory that IPG data can consume. With
Application Server 3.4.1 and this new release of client code, the memory threshold is
now configurable by setting the following values:
•
•
Leave Largest Contiguous Free KB. The value in this field indicates, in kilobytes,
the minimum amount of contiguous free memory ("largest contiguous free block")
that the IPG daemon in the set-tops must see available in order to download IPG
files.
Note: The valid range is from 50 KB to 65535 KB.
Recommended/Default setting: 512 KB
•
Additional Total Free in Excess of Largest Contiguous KB. The value in this field
indicates, in kilobytes, the minimum amount of additional free memory above and
beyond the largest contiguous block that the IPG daemon in the set-tops must see
available in order to download IPG files. For example, if Leave Largest
Contiguous Free KB is set to 512 and Additional Total Free in Excess of Largest
Contiguous KB is set to 256, then there must be at least 768 KB of total free
memory.
Note
: T
he valid range is from 0 KB to 65535 KB.
R
ecommended/Default setting: 256 KB
Use Fixed Size Grid File Data Allocations KB. The value in this field indicates for
SARA to pre-allocate the amount of memory that is configured. This size must be at
least 10 percent more than the largest IPG file that currently exists on the system. The
size must be larger in order to guarantee room for new data as time progresses. This
option actually uses more memory than if the option were not being used because of
the inclusion of the 10 percent buffer. However, using this option guarantees that at
each midnight, the new data coming in will fit into the existing allocations without
having to release and reallocate memory. SARA just reuses the exact same memory
previously occupied by the day that has expired at midnight. This behavior has the
potential to reduce memory fragmentation that could otherwise cause the IPG
allocation request to fail and thus not load data in set-tops that are tight on memory.
In this configuration there should be no problem fitting the new data into memory
for the new day.