I think that there are no qdiscs that permit to drop the oldest
frame of a queue when this queue is full, but I would like to
be wrong:
bfifo drops arriving frames when the max queue length is reached.
red also drops arriving frames in a more elaborate fashion, with
a drop probability that increases above a limit and becomes a drop certitude when the max queue length is reached.
sfq drops "fairly", it piles frames with same (ip source, ip dest, port source and port dest) and drops a frame from the
biggest pile to favour the smaller flows.
But I cannot find the qdisc that reacts like a bfifo or red qdisc but drops the oldest message of the queue when a drop is needed.
Even better: a qdisc with an autodestruct algorithm for each
frame in the queue that would garantee the "freshness" of each frame coming out.
If you know of such qdiscs, please share.
What sort of thing do you want this for?
I made a version of esfq head drop for use in specific circumstances.
The only other thing I thought head drop generally could be usefull for is a game server, but then maybe a policer would be better than a queue WRT latency.
Andy.
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