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: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h
index 115033f..fa26e20 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k.h
+++ b/drivers/net/ethernet/intel/fm10k/fm10k.h
@@ -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)