system semi-freezes on mbuf cluster limit

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

I just experienced a nasty situation:  I ran out of mbuf clusters (6656) and ppp was one of the processes stuck in objcache_get.

even after some clusters drained (from netstat -m output), the objcache depot didn't get free entries back and ppp stayed stuck.  and of course because of this no mbuf clusters were freed (ppp would have to transmit them, i guess).  I was doing some serious down/uploading at the moment.

this should not happen, or at least more gracefully.

cheers
 simon

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