Date: Wed, 10 Apr 2013 10:16:44 +0000 (GMT)
From: EUNBONG SONG <eunb.song@samsung.com>
Subject: [PATCH] staging: Enhance cpu load-balance octeon ethernet driver
To: david.daney@cavium.com
Cc: linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org
Reply-to: eunb.song@samsung.com
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Currently, CPU for RX napi handler is scheduled when backlog packet count is greater than budget * cores_in_use.
If more cpus are used for RX napi handler, there is low possibility backlog packet count is greater than budget * cores_in_use.
This patch makes CPU for RX napi handler is scheduled when backlog packet count is greater than budget.
I tested with patch and the result is more cpu is scheduled in traffic congestion situation.

Signed-off-by: EunBong Song <eunb.song@samsung.com>
---
 drivers/staging/octeon/ethernet-rx.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/octeon/ethernet-rx.c b/drivers/staging/octeon/ethernet-rx.c
index 34afc16..13f9eae 100644
--- a/drivers/staging/octeon/ethernet-rx.c
+++ b/drivers/staging/octeon/ethernet-rx.c
@@ -300,7 +300,7 @@ static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
 			int cores_in_use = core_state.baseline_cores - atomic_read(&core_state.available_cores);
 			counts.u64 = cvmx_read_csr(CVMX_POW_WQ_INT_CNTX(pow_receive_group));
 			backlog = counts.s.iq_cnt + counts.s.ds_cnt;
-			if (backlog > budget * cores_in_use && napi != NULL)
+			if (backlog > budget && napi != NULL)
 				cvm_oct_enable_one_cpu();
 		}
 
-- 
1.7.0.4
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