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From: Jesse Brandeburg <jesse.brandeburg@intel.com>
To: brian.johnson@intel.com, thomas@monjalon.net, david.marchand@redhat.com
Cc: Jesse Brandeburg <jesse.brandeburg@intel.com>,
	dev@dpdk.org, qi.z.zhang@intel.com
Subject: [dpdk-dev] [PATCH v2 2/2] ice: update writeback policy to reduce latency
Date: Fri, 23 Oct 2020 13:22:00 -0700
Message-ID: <20201023202200.1909832-3-jesse.brandeburg@intel.com> (raw)
In-Reply-To: <20201023202200.1909832-1-jesse.brandeburg@intel.com>

Just like iavf, setting the value to 2us allows for generally good
streaming packet performance while keeping latency down, and
generally keeps the performance of the PF and VF interfaces similar.

The previous value of 0x10 was making latency on a single packet
receive be as much as 16us.

Fixes: 65dfc889d86b ("net/ice: support Rx queue interruption")

Reported-by: Brian Johnson <brian.johnson@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
---
 drivers/net/ice/ice_ethdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index c65125ff3260..0df491f93126 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -3345,7 +3345,7 @@ __vsi_queues_bind_intr(struct ice_vsi *vsi, uint16_t msix_vect,
 		PMD_DRV_LOG(INFO, "queue %d is binding to vect %d",
 			    base_queue + i, msix_vect);
 		/* set ITR0 value */
-		ICE_WRITE_REG(hw, GLINT_ITR(0, msix_vect), 0x10);
+		ICE_WRITE_REG(hw, GLINT_ITR(0, msix_vect), 0x2);
 		ICE_WRITE_REG(hw, QINT_RQCTL(base_queue + i), val);
 		ICE_WRITE_REG(hw, QINT_TQCTL(base_queue + i), val_tx);
 	}
-- 
2.25.4


  parent reply	other threads:[~2020-10-23 20:22 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-23 20:21 [dpdk-dev] [PATCH v2 0/2] intel: fix writeback Jesse Brandeburg
2020-10-23 20:21 ` [dpdk-dev] [PATCH v2 1/2] iavf: Fix performance with writeback policy Jesse Brandeburg
2020-10-23 20:22 ` Jesse Brandeburg [this message]
2020-10-26  1:11 ` [dpdk-dev] [PATCH v2 0/2] intel: fix writeback Zhang, Qi Z

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