Commit a6a39a7f authored Oct 30, 2014 by Eunbong Song Committed by Greg Kroah-Hartman Oct 30, 2014

staging: octeon-ethernet: disable load balance for receiving packet when CONFIG_RPS is enabled.

It's better disable load balance for receiving packet when CONFIG_RPS is enabled.
If not, octeon-ethernet driver select CPU and then the rps select again CPU.
It can be ipi interrupts overhead and packet reordering could be possible.

Signed-off-by: Eunbong Song <eunb.song@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 8369e382

drivers/staging/octeon/ethernet-rx.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -286,6 +286,7 @@ static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
		did_work_request = 1;
		}

		#ifndef CONFIG_RPS
		if (rx_count == 0) {
		/*
		* First time through, see if there is enough
		@@ -300,6 +301,7 @@ static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
		if (backlog > budget * cores_in_use && napi != NULL)
		cvm_oct_enable_one_cpu();
		}
		#endif
		rx_count++;

		skb_in_hw = USE_SKBUFFS_IN_HW && work->word2.s.bufs == 1;