From: Seth Forshee <seth.forshee@canonical.com>
Date: Thu, 15 Nov 2012 14:07:58 +0000 (-0600)
Subject: brcmsmac: Reduce number of entries in tx DMA rings
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=75be3e24eeedbc9ec5faf3483fe9b449abec94e8;p=linux-edison.git

brcmsmac: Reduce number of entries in tx DMA rings

Currently up to 256 frames can be queued for each DMA ring. This is
excessive, and now that we have better flow control we can get by with
less. Experimentation has shown 64 to work well.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Tested-by: Daniel Wagner <wagi@monom.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
index 5710dc0d93b..25c54103ebe 100644
--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
@@ -232,8 +232,8 @@
 
 #define MAX_DMA_SEGS			4
 
-/* Max # of entries in Tx FIFO based on 4kb page size */
-#define NTXD				256
+/* # of entries in Tx FIFO */
+#define NTXD				64
 /* Max # of entries in Rx FIFO based on 4kb page size */
 #define NRXD				256