From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacob Keller Date: Tue, 13 Oct 2015 16:39:12 -0700 Subject: [Intel-wired-lan] [next-queue 15/17] fm10k: change default Tx ITR to 25usec In-Reply-To: <1444779554-20464-1-git-send-email-jacob.e.keller@intel.com> References: <1444779554-20464-1-git-send-email-jacob.e.keller@intel.com> Message-ID: <1444779554-20464-15-git-send-email-jacob.e.keller@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: 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 --- 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