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General Settings Chapter 4, Xgig TraceControl Capture Configuration
Xgig Analyzer User’s Guide 103
Figure 48: Number of Segments and Trace Size
The total capture buffer memory can be divided into equal segments by specifying the number of
segments or the size of each segment, and segments are numbered from 1 to
n
. The maximum
number of segments is 128. The minimum size for traces is 2MB.
This same relationship between the fields exists when analyzing multiplexed SAS/SATA ports
(Signal Regeneration is set to
Analog Passthrough Multiplexed ). However, since the ports
contain two logical links, the maximum trace size will be half of what it would be for
non-multiplexed ports. For example, if you select 4 as the value for
Number of Segments and the
total memory available for a multiplexed port is 2GB, the
Trace Size
value will be set to
approximately 245MB (note that exact value may vary slightly due to the header size). The
Number of Segments
option sets the number of segments per logical link. In the case above, you
have 4 segments for each logical link:
(4 segments X 2 links X 245MB Trace Size = Approximate total port memory size).
Number of Segments sets up the segmentation
of the buffer for all ports in the domain
Trace Size cannot be more than the max
size allowed for a single segment;
Trace Size can be set less than the max size
Values for Number
of Segments and
Trace Size are
interrelated
As the number of segments increases
the Trace Size decreases.