Messages in this thread Patch in this message | | | Date | Wed, 26 Sep 2007 15:45:59 -0700 | From | Mark Gross <> | Subject | Re: [RFC] QoS power example / hack |
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The following patch is a bit of a hack to illustrate how the qos parameter infrastructure can communication information to the e1000 driver to use to set interrupt consolidation policy as a function of acceptable network latency.
Its just an example.
Signed-off-by: Mark Gross <mgross@linux.intel.com>
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos-nolatency.c/drivers/net/e1000/e1000_main.c linux-2.6.23-rc8-qos-apps/drivers/net/e1000/e1000_main.c --- linux-2.6.23-rc8-qos-nolatency.c/drivers/net/e1000/e1000_main.c 2007-09-26 13:54:33.000000000 -0700 +++ linux-2.6.23-rc8-qos-apps/drivers/net/e1000/e1000_main.c 2007-09-26 15:00:17.000000000 -0700 @@ -27,6 +27,7 @@ *******************************************************************************/ #include "e1000.h" +#include <linux/qos_params.h> #include <net/ip6_checksum.h> char e1000_driver_name[] = "e1000"; @@ -2764,6 +2765,7 @@ { unsigned int retval = itr_setting; struct e1000_hw *hw = &adapter->hw; + int requested_latency = qos_requirement(QOS_NETWORK_LATENCY); if (unlikely(hw->mac_type < e1000_82540)) goto update_itr_done; @@ -2803,6 +2805,13 @@ break; } + if (requested_latency < 50) + retval = lowest_latency; + else if (requested_latency < 250) + retval = low_latency; + else + ; //don't change the current algorithm + update_itr_done: return retval; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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