Date: Wed, 15 Jul 2015 15:38:21 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Re: FreeBSD 10.1 Memory Exhaustion Message-ID: <55A6C4BD.5090500@denninger.net> In-Reply-To: <55A6C0A4.1030300@digiware.nl> References: <CAB2_NwCngPqFH4q-YZk00RO_aVF9JraeSsVX3xS0z5EV3YGa1Q@mail.gmail.com> <55A3A800.5060904@denninger.net> <55A4D5B7.2030603@freebsd.org> <55A4E5AB.8060909@netlabs.org> <CACfj5vJvAz9StvjTrA1TzfS%2BMhi_qSrOc_qBNHr8qXbiAj81xw@mail.gmail.com> <1436989410.1427298.324703241.421E814B@webmail.messagingengine.com> <55A6C0A4.1030300@digiware.nl>
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This is a cryptographically signed message in MIME format. --------------ms090206030707000801090107 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 7/15/2015 15:20, Willem Jan Withagen wrote: > On 15/07/2015 21:43, Mark Felder wrote: >> >> On Tue, Jul 14, 2015, at 10:10, Sean Chittenden wrote: >>> I think the reason this is not seen more often is because people >>> frequently >>> throw limits on the arc in /boot/loader.conf: >>> >>> vfs.zfs.arc_min=3D"18G" >>> vfs.zfs.arc_max=3D"149G" >>> >>> ZFS ARC *should* not require those settings, but does currently for m= ixed >>> workloads (i.e. databases) in order to be "stable". By setting fixed= >>> sizes >>> on the ARC, UMA and ARC are much more cooperative in that they have t= heir >>> own memory regions to manage so this behavior is not seen as often. >>> >>> To be clear, however, it should not be necessary to set parameters li= ke >>> these in /boot/loader.conf in order to obtain consistent operational >>> behavior. I'd be curious to know if someone running 10.2 BETA withou= t >>> patches is able to trigger this behavior or not. There was work done= >>> that >>> reported helped with this between 10.1 and now. To what extent it >>> helped, >>> however, I don't have any advice yet. >>> >> I was about to email "I have 12TB at home and 4GB of RAM with a very >> erratic workload and never run into any issues" and then I looked at >> /boot/loader.conf and saw vfs.zfs.arc_max=3D"2G" >> >> Now I'm too scared to turn it off... :-) > Same here. > Just a leftover of all the advise to limit arc in the past. > Just bit the bullit: installed BETA1, killed the settings and rebooted.= > We'll see what comes of it. > > --WjW If you get bit I have refactored the patch for 10.2-BETA1 to get rid of the fudges and i386 linker problem and uploaded it, so if you run into trouble try applying that and see if that fixes it. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D187594 --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms090206030707000801090107 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; 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