[Intel-wired-lan] [next-queue 15/17] fm10k: change default Tx ITR to 25usec
Jacob Keller
jacob.e.keller at intel.com
Tue Oct 13 23:39:12 UTC 2015
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 at intel.com>
---
drivers/net/ethernet/intel/fm10k/fm10k.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h
index bf2cc6f78418..5eb42fd21d3f 100644
--- 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)
--
2.6.1.264.gbab76a9
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