On Wed, Jul 30, 2003 at 01:23:21AM +0000, Tor.Egge_at_cvsup.no.freebsd.org wrote: > > The indication of this is that the g_bio zone does not return to > > zero USED as it should. > > It looks like z->uz_cachefree is slightly out of date (updated in > zone_timout() every 20th second) and often too low (not taking the > z->uz_full_bucket list into account). > > The enclosed patch recalculates the number of free elements on the > buckets instead of using z->uz_cachefree. > > - Tor Egge > We took this into account when we did the comparison. We know that uz_cachefree is only a snapshot count; but Poul-Henning`s patch clearly illustrates a frequent fluctuation in the free zone value but where the actual number of allocated g_bio zone elements stays stable at 0, for example. The fact that the problem is solved when buckets are disabled also is indicative that there is a clear reentrancy problems somewhere. There may also be some bucket leakage (although I have not yet confirmed this) as well. -- Bosko Milekic * bmilekic_at_technokratis.com * bmilekic_at_FreeBSD.org TECHNOkRATIS Consulting Services * http://www.technokratis.com/Received on Tue Jul 29 2003 - 17:14:54 UTC
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