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From: Adrian Chadd <adrian@FreeBSD.org>
Date: Sat, 26 Mar 2011 11:58:29 +0000 (UTC)
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Subject: svn commit: r220033 - head/sys/dev/ath
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Author: adrian
Date: Sat Mar 26 11:58:29 2011
New Revision: 220033
URL: http://svn.freebsd.org/changeset/base/220033

Log:
  If 802.11n is enabled, bump the number of buffers used up to a larger
  level.
  
  This is important for AMPDU RX as each burst is multiple packets in a row.

Modified:
  head/sys/dev/ath/if_athvar.h

Modified: head/sys/dev/ath/if_athvar.h
==============================================================================
--- head/sys/dev/ath/if_athvar.h	Sat Mar 26 11:25:36 2011	(r220032)
+++ head/sys/dev/ath/if_athvar.h	Sat Mar 26 11:58:29 2011	(r220033)
@@ -43,6 +43,14 @@
 
 #define	ATH_TIMEOUT		1000
 
+/*
+ * 802.11n requires more TX and RX buffers to do AMPDU.
+ */
+#ifdef	AH_ENABLE_11N
+#define	ATH_TXBUF	512
+#define	ATH_RXBUF	512
+#endif
+
 #ifndef ATH_RXBUF
 #define	ATH_RXBUF	40		/* number of RX buffers */
 #endif