Adrian Chadd 23ced6c117 Implement a global (all non-mgmt traffic) TX ath_buf limitation when
ath_start() is called.

This (defaults to 10 frames) gives for a little headway in the TX ath_buf
allocation, so buffer cloning is still possible.

This requires a lot omre experimenting and tuning.

It also doesn't stop a node/TID from consuming all of the available
ath_buf's, especially when the node is going through high packet loss
or only talking at a low TX rate.  It also doesn't stop a paused TID
from taking all of the ath_bufs.  I'll look at fixing that up in subsequent
commits.

PR:	kern/168170
2012-06-14 00:51:53 +00:00
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