- bump __FreeBSD version to reflect added buf_ring, memory barriers,

  and ifnet functions

- add memory barriers to <machine/atomic.h>
- update drivers to only conditionally define their own

- add lockless producer / consumer ring buffer
- remove ring buffer implementation from cxgb and update its callers

- add if_transmit(struct ifnet *ifp, struct mbuf *m) to ifnet to
  allow drivers to efficiently manage multiple hardware queues
  (i.e. not serialize all packets through one ifq)
- expose if_qflush to allow drivers to flush any driver managed queues

This work was supported by Bitgravity Inc. and Chelsio Inc.

1 files changed, 8 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 75e0e1c..e66fd7e 100644
--- a/UPDATING
+++ b/UPDATING
@@ -22,6 +22,14 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 8.x IS SLOW:
 	to maximize performance.  (To disable malloc debugging, run
 	ln -s aj /etc/malloc.conf.)
 
+20081121:
+	__FreeBSD_version 800054 adds memory barriers to 
+	<machine/atomic.h>, new interfaces to ifnet to facilitate 
+	multiple hardware transmit queues for cards that support
+	them, and a lock-less ring-buffer implementation to
+	enable drivers to more efficiently manage queueing of 
+	packets.
+
 20081117:
 	A new version of ZFS (version 13) has been merged to -HEAD.
 	This version has zpool attribute "listsnapshots" off by