linux-kernel - [PATCH 3.16 04/17] bna: fix performance regression

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Message-Id: <20140808213457.694047573@linuxfoundation.org>
Date:	Fri,  8 Aug 2014 14:35:26 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ivan Vecera <ivecera@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 04/17] bna: fix performance regression

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ivan Vecera <ivecera@...hat.com>

[ Upstream commit c36c9d50cc6af5c5bfcc195f21b73f55520c15f9 ]

The recent commit "e29aa33 bna: Enable Multi Buffer RX" is causing
a performance regression. It does not properly update 'cmpl' pointer
at the end of the loop in NAPI handler bnad_cq_process(). The result is
only one packet / per NAPI-schedule is processed.

Signed-off-by: Ivan Vecera <ivecera@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/brocade/bna/bnad.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -600,9 +600,9 @@ bnad_cq_process(struct bnad *bnad, struc
 	prefetch(bnad->netdev);
 
 	cq = ccb->sw_q;
-	cmpl = &cq[ccb->producer_index];
 
 	while (packets < budget) {
+		cmpl = &cq[ccb->producer_index];
 		if (!cmpl->valid)
 			break;
 		/* The 'valid' field is set by the adapter, only after writing


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