On Wed, Jan 18, 2006 at 10:19:01AM -0800, Sean Hefty wrote:
> Roland Dreier wrote:
> > > + UCMA_MAX_BACKLOG = 128
> >
> >Is there any reason that we might want to make this a tunable? Maybe
> >as a module parameter that's writable in sysfs...
>
> There's no reason not to make this tunable.
Yes, there are reasons to NOT make something a tunable:
o increases system complexity (admin)
o increases the amount of documentation (learning curve)
o increases test matrix/cost (devel/support cost)
o generally hurts performance (var vs a constant of the same value)
Any reason to make something a tunable has to compensate
for the above drawbacks. An answer to Roland's question
is a reasonable prerequisite if someone wants add a tunable.
IB doesn't have the much in /sys/class/infiniband* or module parameters
and I think that's a Good Thing.
grant
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