On 04/05/2017 02:38 PM, Doug Ledford wrote:
On Mon, 2017-03-20 at 17:26 -0700, Dennis Dalessandro wrote:
+static unsigned int hfi1_no_user_mr_percpu;
+module_param_named(no_user_mr_percpu, hfi1_no_user_mr_percpu, uint,
+ S_IRUGO);
+MODULE_PARM_DESC(no_user_mr_percpu,
+ "Avoid percpu refcount for user MRs (default 0)");
+
Does this have to be a module parameter? Those are frowned upon now a
days...
Yeah I don't like it either really, but there is a pretty big tradeoff
between memory deregistration improvement and cost to the data path.
Most use cases care about the data path but some uses register and
deregister memory a lot and this helps them.
Is there a another way we should be looking at for setting things like this?
-Denny
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