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Open Source and information security mailing list archives
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Date: Mon, 11 Mar 2013 19:56:55 +0000 From: Ben Hutchings <bhutchings@...arflare.com> To: David Miller <davem@...emloft.net> CC: <netdev@...r.kernel.org>, <linux-net-drivers@...arflare.com>, <scrum-linux@...arflare.com> Subject: [PATCH net-next 17/22] sfc: Explicitly prefetch RX hash prefix, not just Ethernet heade Currently we prefetch from the Ethernet header, but we will also read the hash prefix. In practice they should be in the same cache line and this won't hurt, but it is still pointless to add on the hash prefix size. Signed-off-by: Ben Hutchings <bhutchings@...arflare.com> --- drivers/net/ethernet/sfc/rx.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 23d67d1..8e78a2f 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -458,7 +458,7 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, /* Prefetch nice and early so data will (hopefully) be in cache by * the time we look at it. */ - prefetch(efx_rx_buf_va(rx_buf) + efx->type->rx_buffer_hash_size); + prefetch(efx_rx_buf_va(rx_buf)); /* Pipeline receives so that we give time for packet headers to be * prefetched into cache. -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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