thread taskq / unp_gc() using 100% cpu and stalling unix socket IPC

[Markus Gebert]

On 14.11.2012, at 04:30, Alfred Perlstein <bright at mu.org> wrote:

> A couple of ideas:

Thanks.

> 1) convert the taskqueue to a callout, but only allow one to be queued at a time.  set the granularity.

I think Konstantin's patch is going in this direction.


> 2) I think you only need to actually run garbage collection on the off-chance that you pass unix file descriptors, otherwise you can get away with refcounting.

Hm, isn't that whats done currently? gc is only scheduled if fds are inflight while uipc_detach() is called.


>  It's hard for me to express the exact logic needed for this though.  I think you would need some way to simply do refcounting until there was a unix socket descriptor in flight, then switch to gc.   Either that or make a sysctl that allows you administratively deny passing of unix descriptors and just use refcounting.



Markus