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authorNick Nunley <nicholasx.d.nunley@intel.com>2010-02-17 01:05:56 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-17 13:21:39 -0800
commit58fd62f525e1182fbb2f7566aecb4545720d9aad (patch)
tree50221de0473a8ebe0bf5af0fef56e370aa7c1243 /drivers
parentfe0592b4be0ce362e87cefd4f6dbf12cb5704d1b (diff)
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igb: change descriptor control thresholds
This change simplifies the code by setting RX_PTHRESH to 8 for all devices, as it was unlikely that there was any advantage to set it at 16 for earlier cards. Additionally TX_WTHRESH is set to 1 for the 82576 NIC to improve performance by enabling a minimal amount of write combining when writing back descriptors. Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/igb/igb.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index 7854b66648c7..a1775705b24c 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -95,13 +95,13 @@ struct vf_data_storage {
* descriptors until either it has this many to write back, or the
* ITR timer expires.
*/
-#define IGB_RX_PTHRESH (hw->mac.type <= e1000_82576 ? 16 : 8)
+#define IGB_RX_PTHRESH 8
#define IGB_RX_HTHRESH 8
#define IGB_RX_WTHRESH 1
#define IGB_TX_PTHRESH 8
#define IGB_TX_HTHRESH 1
#define IGB_TX_WTHRESH ((hw->mac.type == e1000_82576 && \
- adapter->msix_entries) ? 0 : 16)
+ adapter->msix_entries) ? 1 : 16)
/* this is the size past which hardware will drop packets when setting LPE=0 */
#define MAXIMUM_ETHERNET_VLAN_SIZE 1522