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| author | Matteo Croce <mcroce@redhat.com> | 2019-10-24 19:24:58 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-10-28 13:44:26 -0700 |
| commit | a0c78337dd3a4900bc8628a511131b5a0b1db42a (patch) | |
| tree | 702fa3ce30da52c3e976efd43f3134777ad80dcd /drivers/net/ethernet | |
| parent | e1921168bbd4810de4197446e52f652cd0dd9541 (diff) | |
| download | linux-a0c78337dd3a4900bc8628a511131b5a0b1db42a.tar.gz linux-a0c78337dd3a4900bc8628a511131b5a0b1db42a.tar.bz2 linux-a0c78337dd3a4900bc8628a511131b5a0b1db42a.zip | |
mvpp2: prefetch frame header
When receiving traffic, eth_type_trans() is high up on the perf top list,
because it's the first function which access the packet data.
Move the DMA unmap a bit higher, and put a prefetch just after it, so we
have more time to load the data into the cache.
The packet rate increase is about 14% with a tc drop test: 1620 => 1853 kpps
Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
| -rw-r--r-- | drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index c66943219e1b..17e24c1e1c2b 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -2962,6 +2962,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, dma_sync_single_for_cpu(dev->dev.parent, dma_addr, rx_bytes + MVPP2_MH_SIZE, DMA_FROM_DEVICE); + prefetch(data); if (bm_pool->frag_size > PAGE_SIZE) frag_size = 0; |