From: Jesper Dangaard Brouer <brouer@redhat.com>
To: netdev@vger.kernel.org
Cc: Alexander Duyck <alexander.duyck@gmail.com>,
linux-mm@kvack.org, Jesper Dangaard Brouer <brouer@redhat.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux.com>
Subject: [PATCH 3/4] ixgbe: bulk free SKBs during TX completion cleanup cycle
Date: Fri, 23 Oct 2015 14:46:16 +0200 [thread overview]
Message-ID: <20151023124616.17364.61007.stgit@firesoul> (raw)
In-Reply-To: <20151023124451.17364.14594.stgit@firesoul>
There is an opportunity to bulk free SKBs during reclaiming of
resources after DMA transmit completes in ixgbe_clean_tx_irq. Thus,
bulk freeing at this point does not introduce any added latency.
Simply use napi_consume_skb() which were recently introduced. The
napi_budget parameter is needed by napi_consume_skb() to detect if it
is called from netpoll.
Benchmarking IPv4-forwarding, on CPU i7-4790K @4.2GHz (no turbo boost)
Single CPU/flow numbers: before: 1982144 pps -> after : 2064446 pps
Improvement: +82302 pps, -20 nanosec, +4.1%
(SLUB and GCC version 5.1.1 20150618 (Red Hat 5.1.1-4))
Joint work with Alexander Duyck.
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 9f8a7fd7a195..4614dfb3febd 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1090,7 +1090,7 @@ static void ixgbe_tx_timeout_reset(struct ixgbe_adapter *adapter)
* @tx_ring: tx ring to clean
**/
static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
- struct ixgbe_ring *tx_ring)
+ struct ixgbe_ring *tx_ring, int napi_budget)
{
struct ixgbe_adapter *adapter = q_vector->adapter;
struct ixgbe_tx_buffer *tx_buffer;
@@ -1128,7 +1128,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
total_packets += tx_buffer->gso_segs;
/* free the skb */
- dev_consume_skb_any(tx_buffer->skb);
+ napi_consume_skb(tx_buffer->skb, napi_budget);
/* unmap skb header data */
dma_unmap_single(tx_ring->dev,
@@ -2784,7 +2784,7 @@ int ixgbe_poll(struct napi_struct *napi, int budget)
#endif
ixgbe_for_each_ring(ring, q_vector->tx)
- clean_complete &= !!ixgbe_clean_tx_irq(q_vector, ring);
+ clean_complete &= !!ixgbe_clean_tx_irq(q_vector, ring, budget);
if (!ixgbe_qv_lock_napi(q_vector))
return budget;
--
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next prev parent reply other threads:[~2015-10-23 12:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-23 12:46 [PATCH 0/4] net: mitigating kmem_cache slowpath for network stack in NAPI context Jesper Dangaard Brouer
2015-10-23 12:46 ` [PATCH 1/4] net: bulk free infrastructure for NAPI context, use napi_consume_skb Jesper Dangaard Brouer
2015-10-23 12:46 ` [PATCH 2/4] net: bulk free SKBs that were delay free'ed due to IRQ context Jesper Dangaard Brouer
2015-10-23 12:46 ` Jesper Dangaard Brouer [this message]
2015-10-23 12:46 ` [PATCH 4/4] net: bulk alloc and reuse of SKBs in NAPI context Jesper Dangaard Brouer
2015-10-27 1:09 ` [PATCH 0/4] net: mitigating kmem_cache slowpath for network stack " David Miller
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