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e1000/e1000e: implement a simple interrupt moderation

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Back before e1000-7.3.20, the e1000 driver had a simple algorithm that
managed interrupt moderation.  The driver was updated in 7.3.20 to
have the new "adaptive" interrupt moderation but we have customer
requests to redeploy the old way as an option.  This patch adds the
old functionality back.  The new functionality can be enabled via
module parameter or at runtime via ethtool.
Module parameter: (InterruptThrottleRate=4) to use this new
moderation method.
Ethtool method: ethtool -C ethX rx-usecs 4

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesse Brandeburg
2010-05-04 22:26:03 +00:00
committed by David S. Miller
parent edf15c1742
commit eab2abf582
6 changed files with 57 additions and 10 deletions
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10
drivers/net/e1000/e1000_param.c
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@@ -484,11 +484,17 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter)
adapter->itr_setting = adapter->itr;
adapter->itr = 20000;
break;
case 4:
e_dev_info("%s set to simplified "
"(2000-8000) ints mode\n", opt.name);
adapter->itr_setting = adapter->itr;
break;
default:
e1000_validate_option(&adapter->itr, &opt,
adapter);
/* save the setting, because the dynamic bits change itr */
/* clear the lower two bits because they are
/* save the setting, because the dynamic bits
* change itr.
* clear the lower two bits because they are
* used as control */
adapter->itr_setting = adapter->itr & ~3;
break;