Hints On Optimizing The Tc Rule Table - RuggedCom RuggedRouter RX1000 User Manual

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RuggedRouter User Guide
The TOS field specifies the packet TOS value to match. The field may be decimal or
hex.

Hints on optimizing the TC Rule table

Every rule is processed in table order for every packet, unless a CONTINUE rule is
matched, in which case processing stops. This can be used to improve efficiency in
combination with the SAVE and RESTORE rules. For example, consider a TC Rules
table organized roughly as follows (and in the same order):
A RESTORE rule is used to restore the connection's mark to a matching,
•
unmarked packet
A CONTINUE if the mark is non zero
•
Specific rules to check criteria to assign a mark, and finally
•
A SAVE mark to connection if the mark is non zero (ie a match was found
•
above)
Using the above structure for the TC Rules table, only the first packet of any tcp or
udp connection will have to go through all the rules, while every following packet will
have its mark restored by the first rule, and then CONTINUE, skipping potentially
many matching rules in the remainder of the table.
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