From: Hyeonggon Yoo <42.hyeyoo@gmail.com>
To: netdev@vger.kernel.org
Cc: Shay Agroskin <shayagr@amazon.com>,
Arthur Kiyanovski <akiyano@amazon.com>,
David Arinzon <darinzon@amazon.com>,
Noam Dagan <ndagan@amazon.com>, Saeed Bishara <saeedb@amazon.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Sameeh Jubran <sameehj@amazon.com>,
Wei Yongjun <weiyongjun1@huawei.com>,
Lorenzo Bianconi <lorenzo@kernel.org>,
linux-kernel@vger.kernel.org, Hyeonggon Yoo <42.hyeyoo@gmail.com>
Subject: [PATCH] net: ena: Do not waste napi skb cache
Date: Sun, 23 Jan 2022 11:56:23 +0000 [thread overview]
Message-ID: <20220123115623.94843-1-42.hyeyoo@gmail.com> (raw)
By profiling, discovered that ena device driver allocates skb by
build_skb() and frees by napi_skb_cache_put(). Because the driver
does not use napi skb cache in allocation path, napi skb cache is
periodically filled and flushed. This is waste of napi skb cache.
As ena_alloc_skb() is called only in napi, Use napi_build_skb()
instead of build_skb() to when allocating skb.
This patch was tested on aws a1.metal instance.
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
---
drivers/net/ethernet/amazon/ena/ena_netdev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index c72f0c7ff4aa..2c67fb1703c5 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1407,7 +1407,7 @@ static struct sk_buff *ena_alloc_skb(struct ena_ring *rx_ring, void *first_frag)
skb = netdev_alloc_skb_ip_align(rx_ring->netdev,
rx_ring->rx_copybreak);
else
- skb = build_skb(first_frag, ENA_PAGE_SIZE);
+ skb = napi_build_skb(first_frag, ENA_PAGE_SIZE);
if (unlikely(!skb)) {
ena_increase_stat(&rx_ring->rx_stats.skb_alloc_fail, 1,
--
2.33.1
next reply other threads:[~2022-01-23 11:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-23 11:56 Hyeonggon Yoo [this message]
2022-01-24 8:57 ` [PATCH] net: ena: Do not waste napi skb cache Julian Wiedmann
2022-01-24 9:29 ` Julian Wiedmann
2022-01-24 20:50 ` Shay Agroskin
2022-01-25 9:34 ` Hyeonggon Yoo
2022-01-25 13:50 ` Julian Wiedmann
2022-01-29 8:56 ` Hyeonggon Yoo
2022-01-25 13:45 ` Julian Wiedmann
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