| Message ID | 1445018231-3196-15-git-send-email-jacob.e.keller@intel.com |
|---|---|
| State | Accepted |
| Delegated to: | Jeff Kirsher |
| Headers | show |
-----Original Message----- From: Intel-wired-lan [mailto:intel-wired-lan-bounces@lists.osuosl.org] On Behalf Of Jacob Keller Sent: Friday, October 16, 2015 10:57 AM To: Intel Wired LAN <intel-wired-lan@lists.osuosl.org> Subject: [Intel-wired-lan] [next-queue v5 15/17] 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>
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k.h b/drivers/net/ethernet/intel/fm10k/fm10k.h index 7bf0c2ddce75..2a16cd1b2a8b 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)
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> --- drivers/net/ethernet/intel/fm10k/fm10k.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)