net: stmmac: Optimize cache prefetch in RX path

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Current code prefetches cache lines for the received frame first, and
then dma_sync_single_for_cpu() against this frame, this is wrong.
Cache prefetch should be triggered after dma_sync_single_for_cpu().

This patch brings ~2.8% driver performance improvement in a TCP RX
throughput test with iPerf tool on a single isolated Cortex-A65 CPU
core, 2.84 Gbits/sec increased to 2.92 Gbits/sec.

Signed-off-by: Furong Xu <0x1207@gmail.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

...

This commit is contained in:

Furong Xu 2025-01-15 11:27:04 +08:00 • committed by Paolo Abeni

parent 2324c78a75

commit 2a2931517c

1 changed files with 1 additions and 4 deletions

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5

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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