On Mar 29, 2010, at 10:43 AM, Barry Pederson wrote: > I've been using the arc_summary.pl script from here: > > http://jhell.googlecode.com/svn/base/head/scripts/zfs/arc_summary/arc_summary.pl > > and noticed some odd numbers, with the ARC Current Size being larger than the > Max Size, and the breakdown adding up to less than the current size as shown > below
I believe the current size can be larger than the max if your working data set is large enough. The ARC can't evict data that is still being referenced. When I last looked (over a year ago) there was no mechanism to provide back pressure from the ARC to the VM layer to request that more nodes be released to help deal with this situation. I don't know if that really helps at all, but I just thought I would add the data point from my previous debugging sessions with zfs. - Ben_______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
