From 0cd3fdea07d8e0f0f5bac7534892b785af37e387 Mon Sep 17 00:00:00 2001 From: Claudiu Manoil Date: Tue, 29 Jan 2013 03:55:10 +0000 Subject: [PATCH] gianfar: Optimize struct gfar_priv_tx_q for two cache lines Resize and regroup structure members to eliminate memory holes and to pack the structure into 2 cache lines (from 3). tx_ring_size was resized from 4 to 2 bytes and few members were re-grouped in order to eliminate byte holes and achieve compactness. Where possible, few members were grouped according to their usage and access order (i.e. start_xmit vs. clean_tx_ring members), less important members were pushed at the end. Signed-off-by: Claudiu Manoil Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/gianfar.h | 25 ++++++++++++------------ 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h index 91bb2de9ba8d..045c0d28ed6c 100644 --- a/drivers/net/ethernet/freescale/gianfar.h +++ b/drivers/net/ethernet/freescale/gianfar.h @@ -935,26 +935,25 @@ struct tx_q_stats { * @txtime: coalescing value if based on time */ struct gfar_priv_tx_q { + /* cacheline 1 */ spinlock_t txlock __attribute__ ((aligned (SMP_CACHE_BYTES))); - struct sk_buff ** tx_skbuff; - /* Buffer descriptor pointers */ - dma_addr_t tx_bd_dma_base; struct txbd8 *tx_bd_base; struct txbd8 *cur_tx; - struct txbd8 *dirty_tx; + unsigned int num_txbdfree; + unsigned short skb_curtx; + unsigned short tx_ring_size; struct tx_q_stats stats; - struct net_device *dev; struct gfar_priv_grp *grp; - u16 skb_curtx; - u16 skb_dirtytx; - u16 qindex; - unsigned int tx_ring_size; - unsigned int num_txbdfree; + /* cacheline 2 */ + struct net_device *dev; + struct sk_buff **tx_skbuff; + struct txbd8 *dirty_tx; + unsigned short skb_dirtytx; + unsigned short qindex; /* Configuration info for the coalescing features */ - unsigned char txcoalescing; + unsigned int txcoalescing; unsigned long txic; - unsigned short txcount; - unsigned short txtime; + dma_addr_t tx_bd_dma_base; }; /* -- 2.30.2