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Compression Measurement Variables

These variables are specific to the compression feature. The standard measurement variables measure the actual data (compressed and uncompressed) that passes through the link. The compression variables allow you to analyze the effectiveness of compression on your link.

Note: The compression measurement variables, unlike the regular variables, do not include link and header overhead. Because of this difference, it doesn't make sense to compare the compression measurement variables with the regular link, class, and partition variables.

Table of Common Variables

The Common variables are available for all measurement types (link, partition, and class).

Common Variables Description
bytes-saved-by-compression

Number of bytes that didn't have to traverse the link, due to compression; allows you to see how many bytes the compression feature actually saved on a link, partition, or class
Formula: precompression-bytes — postcompression-bytes

Note: A value of 0 (zero) means either that there weren’t any bytes saved by compression.
bytes-saved-by-compression%

Percentage of bytes saved, due to compression, in the designated time interval
Formula: ((precompression-bytes - postcompression-bytes) / precompression-bytes)*100

For example, if the compressed size is 5 bytes and the uncompressed size is 10 bytes, the bytes-saved-by-compression% is 50%.
compressible-bytes Number of uncompressed bytes that belong to a compressible service
Formula: precompression-bytes — non-compressible-bytes
non-compressible-bytes Number of bytes that PacketWise didn't attempt to compress either because they didn't belong to a compressible service or because they weren't compressible
postcompression-avg-bps Postcompression-bytes, averaged over the interval, in bits per second
postcompression-bytes Number of bytes that actually passed through the unit. It includes bytes that were compressed as well as bytes that weren't compressible.
precompression-bytes Number of bytes that would have passed through the unit if compression had been turned off
precompression-avg-bps Usage, averaged over the interval, if compression had been turned off

Table of Link Variables

Link Variables Description
compression-mode Indicates whether compression is on, off, or has changed during the interval (1=off, 2=changed, 3=on)
postcompression-peak-bps Peak rate recorded for the link when compression is enabled (similar to peak-bps except it doesn't include header or link overhead)
precompression-peak-bps Peak rate that would have been recorded for the link, if compression had been turned off

 


PacketGuide™ for PacketWise® Version 6.0