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(parent: e192116) | patch
mvpp2: prefetch frame header
authorMatteo Croce <mcroce@redhat.com>
Thu, 24 Oct 2019 17:24:58 +0000 (19:24 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 28 Oct 2019 20:44:26 +0000 (13:44 -0700)
commita0c78337dd3a4900bc8628a511131b5a0b1db42a
tree702fa3ce30da52c3e976efd43f3134777ad80dcdtree | snapshot
parente1921168bbd4810de4197446e52f652cd0dd9541commit | diff
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>
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c diff | blob | history
John Crispins staging tree