| Message ID | 2574b35be4a9ccf6c4b1788c854fe8c13951f9d5.1736910454.git.0x1207@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | net: stmmac: RX performance improvement | expand |
在 1/15/25 11:27, Furong Xu 写道: > 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> Thanks, Yanteng > --- > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > index 811e2d372abf..ad928e8e21a9 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > @@ -5508,10 +5508,6 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue) > > /* Buffer is good. Go on. */ > > - prefetch(page_address(buf->page) + buf->page_offset); > - if (buf->sec_page) > - prefetch(page_address(buf->sec_page)); > - > buf1_len = stmmac_rx_buf1_len(priv, p, status, len); > len += buf1_len; > buf2_len = stmmac_rx_buf2_len(priv, p, status, len); > @@ -5533,6 +5529,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue) > > dma_sync_single_for_cpu(priv->device, buf->addr, > buf1_len, dma_dir); > + prefetch(page_address(buf->page) + buf->page_offset); > > xdp_init_buff(&ctx.xdp, buf_sz, &rx_q->xdp_rxq); > xdp_prepare_buff(&ctx.xdp, page_address(buf->page),
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 811e2d372abf..ad928e8e21a9 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -5508,10 +5508,6 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue) /* Buffer is good. Go on. */ - prefetch(page_address(buf->page) + buf->page_offset); - if (buf->sec_page) - prefetch(page_address(buf->sec_page)); - buf1_len = stmmac_rx_buf1_len(priv, p, status, len); len += buf1_len; buf2_len = stmmac_rx_buf2_len(priv, p, status, len); @@ -5533,6 +5529,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue) dma_sync_single_for_cpu(priv->device, buf->addr, buf1_len, dma_dir); + prefetch(page_address(buf->page) + buf->page_offset); xdp_init_buff(&ctx.xdp, buf_sz, &rx_q->xdp_rxq); xdp_prepare_buff(&ctx.xdp, page_address(buf->page),