Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 58fd62f5 authored by Nick Nunley's avatar Nick Nunley Committed by David S. Miller
Browse files

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: default avatarNicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fe0592b4

drivers/net/igb/igb.h

+2 −2
Original line number Original line Diff line number Diff line
@@ -95,13 +95,13 @@ struct vf_data_storage { 
 *           descriptors until either it has this many to write back, or the

 *           descriptors until either it has this many to write back, or the

 *           ITR timer expires.

 *           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_HTHRESH                     8

#define IGB_RX_WTHRESH                     1

#define IGB_RX_WTHRESH                     1

#define IGB_TX_PTHRESH                     8

#define IGB_TX_PTHRESH                     8

#define IGB_TX_HTHRESH                     1

#define IGB_TX_HTHRESH                     1

#define IGB_TX_WTHRESH                     ((hw->mac.type == e1000_82576 && \

#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 */

/* this is the size past which hardware will drop packets when setting LPE=0 */

#define MAXIMUM_ETHERNET_VLAN_SIZE 1522

#define MAXIMUM_ETHERNET_VLAN_SIZE 1522