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Date: Wed, 10 Apr 2013 10:16:44 +0000 (GMT) From: EUNBONG SONG <eunb.song@...sung.com> To: david.daney@...ium.com Cc: linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org Subject: [PATCH] staging: Enhance cpu load-balance octeon ethernet driver 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@...sung.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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