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Increasing the indirection RQ table size from 128 to 256 improves the packet distribution over the NIC HW queues for various cases. Let's take a look at the following scenario: Assuming RSS result distributed uniformly and indirection table is filled with queues in a cyclic manner. Let N be the number of queues on a given setup. If 256%N = 128%N = 0, then all queues have the same probability to be chosen for a given RSS result. This case doesn't improves nor degrade by this change. If 256%N != 0 and 128%N != 0, there is a remainder which will favor some queues. Increasing the indirection RQ table size to 256 reduce the ratio between the favored queues probability to be selected to the rest of the queues and improves the distribution. For example, let's assume the number of queues is 56. For a table size of 128, we have 128%56=16 queues which will have a 3/128 probability to be chosen and 2/128 for the rest 40. 16 queues have 1.5 times the probability to be chosen over the other 40. For a table size of 256, we have 256%56=32 queues which will have a 5/256 probability to be chosen and 4/256 probability for the rest 24 queues. Here 32 queues have 1.25 more probability to be chosen over the other 24. This shows that the larger indirection table size would more likely cause an even distribution. This change also aligns our mlx5 driver's indirection table size with other vendors. Signed-off-by: Noam Stolero <noams@nvidia.com> Reviewed-by: Tal Gilboa <talgi@nvidia.com> Reviewed-by: Tariq Toukan <tariqt@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com> |
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