diff mbox series

[net-next,2/9] e1000: switch to napi_build_skb()

Message ID 20211123171840.157471-3-alexandr.lobakin@intel.com
State Accepted
Delegated to: Anthony Nguyen
Headers show
Series intel: switch to napi_build_skb() | expand

Commit Message

Alexander Lobakin Nov. 23, 2021, 5:18 p.m. UTC 
napi_build_skb() reuses per-cpu NAPI skbuff_head cache in order
to save some cycles on freeing/allocating skbuff_heads on every
new Rx or completed Tx element.
e1000 driver runs Tx completion polling cycle right before the Rx
one. Now that e1000 uses napi_consume_skb() to put skbuff_heads of
completed entries into the cache, it will never empty and always
warm at that moment. Switch to the napi_build_skb() to relax mm
pressure on heavy Rx and increase throughput.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
---
 drivers/net/ethernet/intel/e1000/e1000_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
2.33.1

Comments

Brelinski, Tony Dec. 28, 2021, 12:07 a.m. UTC | #1 
> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Alexander Lobakin
> Sent: Tuesday, November 23, 2021 9:19 AM
> To: intel-wired-lan@lists.osuosl.org
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Jakub Kicinski
> <kuba@kernel.org>; David S. Miller <davem@davemloft.net>
> Subject: [Intel-wired-lan] [PATCH net-next 2/9] e1000: switch to
> napi_build_skb()
> 
> napi_build_skb() reuses per-cpu NAPI skbuff_head cache in order to save
> some cycles on freeing/allocating skbuff_heads on every new Rx or
> completed Tx element.
> e1000 driver runs Tx completion polling cycle right before the Rx one. Now
> that e1000 uses napi_consume_skb() to put skbuff_heads of completed
> entries into the cache, it will never empty and always warm at that moment.
> Switch to the napi_build_skb() to relax mm pressure on heavy Rx and
> increase throughput.
> 
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
> ---
>  drivers/net/ethernet/intel/e1000/e1000_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Tested-by: Tony Brelinski <tony.brelinski@intel.com>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 975a145d48ef..3f5feb55cfba 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -4384,7 +4384,7 @@  static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
 		if (!skb) {
 			unsigned int frag_len = e1000_frag_len(adapter);

-			skb = build_skb(data - E1000_HEADROOM, frag_len);
+			skb = napi_build_skb(data - E1000_HEADROOM, frag_len);
 			if (!skb) {
 				adapter->alloc_rx_buff_failed++;
 				break;