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On Dec 13, 2003, at 2:53 PM, Jonathan Stone wrote:

> Roger that on the initialization and sysctl. I dont grok Andrew's new
> sysctl machinery well enough to just drop in a sysctl hook, let alone
> a sysctl hook that would auto-recompute ip_maxfrags when nmbclusters
> is changed via sysctl. (Which has pros and cons of its own:
> least-suprise cuts both ways on that one).

Here's what I'd do...

Cache the value of nmbclusters used to compute ip_maxfrags 
(ip_maxfrags_nmbclusters, call it), and then do:

	if (__predict_false(ip_maxfrags_nmbclusters != nmbclusters)) {
		ip_maxfrags_nmbclusters = nmbclusters;
		ip_maxfrags = ip_maxfrags_nmbclusters / 4;
	}

...no sysctl magic needed.

         -- Jason R. Thorpe <thorpej@wasabisystems.com>


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