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| author |   Rahul Rameshbabu <rrameshbabu@nvidia.com> | 2023-08-21 16:05:54 -0700 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2023-08-24 17:14:39 -0700 |
| commit | 84a58e60038fa0366006977dba85eae16b2e3d78 (patch) | |
| tree | 2354a2d5be711d9a887d8dad7d02f4f4600b0021 /tools/perf/scripts/python/task-analyzer.py | |
| parent | Merge tag 'net-6.5-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net (diff) | |
| download | wireguard-linux-84a58e60038fa0366006977dba85eae16b2e3d78.tar.xz wireguard-linux-84a58e60038fa0366006977dba85eae16b2e3d78.zip | |
net/mlx5: Dynamic cyclecounter shift calculation for PTP free running clock
Use a dynamic calculation to determine the shift value for the internal
timer cyclecounter that will lead to the highest precision frequency
adjustments. Previously used a constant for the shift value assuming all
devices supported by the driver had a nominal frequency of 1GHz. However,
there are devices that operate at different frequencies. The previous shift
value constant would break the PHC functionality for those devices.
Reported-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Closes: https://lore.kernel.org/netdev/20230815151507.3028503-1-vadfed@meta.com/
Fixes: 6a4010927562 ("net/mlx5: Update cyclecounter shift value to improve ptp free running mode precision")
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Tested-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20230821230554.236210-1-rrameshbabu@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/task-analyzer.py')
0 files changed, 0 insertions, 0 deletions