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authorRosen Penev <rosenp@gmail.com>2017-12-04 11:40:22 -0800
committerFelix Fietkau <nbd@nbd.name>2017-12-08 19:54:37 +0100
commit1c2fdfbaf2fac968706a6fe8ac85af3ba4f27239 (patch)
tree99e9b219b2ec80f926b100efb79858c04b05858b /target/linux/ar71xx/files/drivers
parent524d103e7efb5fb505c4f9549fb9b90755a36100 (diff)
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ag71xx: Reduce NAPI weight to 32.
Qualcomm claims this reduces cache misses. Original commit message below: From: Ben Menchaca <ben.menchaca@qca.qualcomm.com> Date: Tue, 11 Jun 2013 12:18:46 -0500 Subject: [ag71xx] reduce NAPI weight In an attempt to increase our cache warmth, we are decreasing NAPI. This increases the warmth of the reused SKBs. Signed-off-by: Ben Menchaca <ben.menchaca@qca.qualcomm.com> Signed-off-by: Rosen Penev <rosenp@gmail.com>
Diffstat (limited to 'target/linux/ar71xx/files/drivers')
-rw-r--r--target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
index 898bde1d25..a712812916 100644
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
@@ -40,7 +40,12 @@
#define AG71XX_DRV_NAME "ag71xx"
#define AG71XX_DRV_VERSION "0.5.35"
-#define AG71XX_NAPI_WEIGHT 64
+/*
+ * For our NAPI weight bigger does *NOT* mean better - it means more
+ * D-cache misses and lots more wasted cycles than we'll ever
+ * possibly gain from saving instructions.
+ */
+#define AG71XX_NAPI_WEIGHT 32
#define AG71XX_OOM_REFILL (1 + HZ/10)
#define AG71XX_INT_ERR (AG71XX_INT_RX_BE | AG71XX_INT_TX_BE)