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fm10k: change default Tx ITR to 25usec
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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>
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Jacob Keller authored and Jeff Kirsher committed Dec 6, 2015
1 parent 436ea95 commit dbf4284
Showing 1 changed file with 2 additions and 1 deletion.
3 changes: 2 additions & 1 deletion drivers/net/ethernet/intel/fm10k/fm10k.h
Original file line number Diff line number Diff line change
Expand Up @@ -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)

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