Qualcomm claims this reduces cache misses. Original commit message below: From: Ben Menchaca <ben.mench...@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.mench...@qca.qualcomm.com> Signed-off-by: Rosen Penev <ros...@gmail.com> --- .../ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) 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 898bde1..a712812 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) -- 2.7.4 _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev
