[Libdlo] [PATCH] udlfb: high-throughput urb pool

[Andrew Kephart]

On Fri, 2010-12-17 at 12:34 -0800, Greg KH wrote:
> On Fri, Dec 17, 2010 at 02:17:34PM -0600, Andrew Kephart wrote:
> > udlfb: add parameters for URB pool size and for nonblocking URB pool
> > 
[some deleted]
> 
> Ick, no, don't use a module parameter for this, just get it right the
> first time (make it big) and leave it at that.
> 
> thanks,
> 
> greg k-h

Ok.  If that's the preferred model, then I'm all for it.

The reason it's in there, though, is that there's the potential for a
pretty big performance vs. memory tradeoff, where the "right" answer
will depend pretty heavily on the expected usage, so I didn't want to
burn a bunch of memory (>100K) if it isn't going to be needed.  

In cases like this, is there a preferred model for handling that
variability?  Plan for worst-case? Compile-time option?  With sysctl?
Something else?  Toss the pre-allocation model and go on-demand?

-andrew