linux-kernel - [ 145/184] net: reduce net_rx

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Message-Id: <20130604172136.313574799@1wt.eu>
Date:	Tue, 04 Jun 2013 19:23:55 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 145/184] net: reduce net_rx_action() latency to 2 HZ

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Eric Dumazet <edumazt@...gle.com>

We should use time_after_eq() to get maximum latency of two ticks,
instead of three.

Bug added in commit 24f8b2385 (net: increase receive packet quantum)

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
(cherry picked from commit d1f41b67ff7735193bc8b418b98ac99a448833e2)
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index f4a6e14..d775563 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2848,7 +2848,7 @@ static void net_rx_action(struct softirq_action *h)
 		 * Allow this to run for 2 jiffies since which will allow
 		 * an average latency of 1.5/HZ.
 		 */
-		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
+		if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit)))
 			goto softnet_break;
 
 		local_irq_enable();
-- 
1.7.12.2.21.g234cd45.dirty



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