On 2/22/2024 12:38 AM, Jakub Kicinski wrote:
On Mon, 19 Feb 2024 13:37:36 +0100 Jiri Pirko wrote:
devlink dev param show pci/0000:4b:00.0 name tx_scheduling_layers
pci/0000:4b:00.0:
name tx_scheduling_layers type driver-specific
values:
cmode permanent value 9
Set:
devlink dev param set pci/0000:4b:00.0 name tx_scheduling_layers value 5
cmode permanent
It's been almost a year since v1 was posted, could you iterate quicker? :(
Yes... Sorry for iterating so slowly, I promise to do it quicker in the
future. That issue was kind of problematic for us, so it took quite a
long time.
This is kind of proprietary param similar to number of which were shot
down for mlx5 in past. Jakub?
I remain somewhat confused about what this does.
Specifically IIUC the problem is that the radix of each node is
limited, so we need to start creating multi-layer hierarchies
if we want a higher radix. Or in the "5-layer mode" the radix
is automatically higher?
Basically, switching from 9 to 5 layers topology allows us to have 512
leaves instead of 8 leaves which improves performance. I will add this
information to the commit message and Documentation too, when we get an
ACK for devlink parameter.
In the future we plan to extend this feature to support other layer
counts too.
