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Date: Wed, 17 Feb 2010 03:05:56 -0800 From: Jeff Kirsher <jeffrey.t.kirsher@...el.com> To: davem@...emloft.net Cc: netdev@...r.kernel.org, gospo@...hat.com, Nicholas Nunley <nicholasx.d.nunley@...el.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com> Subject: [net-next-2.6 PATCH 17/18] igb: change descriptor control thresholds From: Nick Nunley <nicholasx.d.nunley@...el.com> 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@...el.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com> --- drivers/net/igb/igb.h | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h index 7854b66..a177570 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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