Patchwork [net-next,2/6] igb: reduce size required to trigger low latency

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Submitter Jeff Kirsher
Date Feb. 13, 2009, 4:17 a.m.
Message ID <20090213041721.3848.61896.stgit@lost.foo-projects.org>
Download mbox | patch
Permalink /patch/23098/
State Accepted
Delegated to: David Miller
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Comments

Jeff Kirsher - Feb. 13, 2009, 4:17 a.m.
From: Alexander Duyck <alexander.h.duyck@intel.com>

Update the Adaptive Interrupt Moderation algorithm so that the low latency
state is triggered less easily to prevent high interrupt loads.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/igb/igb_main.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


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David Miller - Feb. 16, 2009, 8:06 a.m.
From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Thu, 12 Feb 2009 20:17:21 -0800

> Update the Adaptive Interrupt Moderation algorithm so that the low latency
> state is triggered less easily to prevent high interrupt loads.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Applied.
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Patch

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 1e7678c..8701330 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2541,7 +2541,7 @@  static unsigned int igb_update_itr(struct igb_adapter *adapter, u16 itr_setting,
 		if (bytes > 25000) {
 			if (packets > 35)
 				retval = low_latency;
-		} else if (bytes < 6000) {
+		} else if (bytes < 1500) {
 			retval = low_latency;
 		}
 		break;