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Commit dbf42848 authored by Jacob Keller's avatar Jacob Keller Committed by Jeff Kirsher
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fm10k: change default Tx ITR to 25usec 



The current default ITR for Tx is overly restrictive. Using a simple
netperf TCP_STREAM test, we top out at about 10Gb/s for a single thread
when running using 1500 byte frames. By reducing the ITR value to 25usec
(up to 40K interrupts a second from 10K), we are able to achieve 36Gb/s
for a single thread TCP stream test.

Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 436ea956

drivers/net/ethernet/intel/fm10k/fm10k.h

+2 −1
Original line number Diff line number Diff line
@@ -171,11 +171,12 @@ struct fm10k_ring_container { 
#define FM10K_ITR_MAX		0x0FFF	/* maximum value for ITR */

#define FM10K_ITR_10K		100	/* 100us */

#define FM10K_ITR_20K		50	/* 50us */

#define FM10K_ITR_40K		25	/* 25us */

#define FM10K_ITR_ADAPTIVE	0x8000	/* adaptive interrupt moderation flag */



#define ITR_IS_ADAPTIVE(itr) (!!(itr & FM10K_ITR_ADAPTIVE))



#define FM10K_TX_ITR_DEFAULT	FM10K_ITR_10K

#define FM10K_TX_ITR_DEFAULT	FM10K_ITR_40K

#define FM10K_RX_ITR_DEFAULT	FM10K_ITR_20K

#define FM10K_ITR_ENABLE	(FM10K_ITR_AUTOMASK | FM10K_ITR_MASK_CLEAR)