net/mlx5e: Increase VF representors' SQ size to 128
authorGavi Teitz <gavi@mellanox.com>
Wed, 12 Dec 2018 19:23:18 +0000 (21:23 +0200)
committerSaeed Mahameed <saeedm@mellanox.com>
Thu, 20 Dec 2018 13:06:00 +0000 (05:06 -0800)
commit4c8fb2986d44c5a75949a88ac61deec0ed50a542
tree1be461265b1e79e5450d461d25a1cdf160258045
parent4a0475d57ad134429f9bb56068bb738b4afc5992
net/mlx5e: Increase VF representors' SQ size to 128

The default size for the VF representors' SQ was too small to handle high
packet rates. Doubling the size from 64 to 128 drastically improves the
packet rate under stress (by about 50%), whereas increasing the size
beyond 128 has not shown to make any further difference.

The impact of the SQ size was measured with UDP traffic, in the following
topology: TG <-> PF <-> TC forwarding <-> VF representor <-> VF in VM
over a single core processing bi-directional traffic, with the following
results:

                                  SQ size of 64:     SQ size of 128:
Packet rate for 64B UDP packets:    860 [Kpps]         1280 [Kpps]
Packet rate for 114B VxLan
encapsulated UDP packets:           320 [Kpps]          500 [Kpps]

Signed-off-by: Gavi Teitz <gavi@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c