Date: Mon, 12 Mar 2018 12:18:33 -1000 (HST) From: Jeff Roberson <jroberson@jroberson.net> To: "Matthew D. Fuller" <fullermd@over-yonder.net> Cc: FreeBSD current <freebsd-current@freebsd.org> Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT Message-ID: <alpine.BSF.2.21.1803121218010.1232@desktop> In-Reply-To: <20180311221313.GF42539@over-yonder.net> References: <20180306173455.oacyqlbib4sbafqd@ler-imac.lerctr.org> <201803061816.w26IGaW5050053@pdx.rh.CN85.dnsmgr.net> <20180306193645.vv3ogqrhauivf2tr@ler-imac.lerctr.org> <20180306221554.uyshbzbboai62rdf@dx240.localdomain> <20180307103911.GA72239@kloomba> <20180311004737.3441dbf9@thor.intern.walstatt.dynvpn.de> <alpine.BSF.2.21.1803111038460.1232@desktop> <20180311221313.GF42539@over-yonder.net>
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On Sun, 11 Mar 2018, Matthew D. Fuller wrote: > On Sun, Mar 11, 2018 at 10:43:58AM -1000 I heard the voice of > Jeff Roberson, and lo! it spake thus: >> >> First, I would like to identify whether the wired memory is in the >> buffer cache. Can those of you that have a repro look at sysctl >> vfs.bufspace and tell me if that accounts for the bulk of your wired >> memory usage? I'm wondering if a job ran that pulled in all of the >> bufs from your root disk and filled up the buffer cache which >> doesn't have a back-pressure mechanism. > > If by "root disk", you mean the one that isn't ZFS, that wouldn't > touch anything here; apart from a md-backed UFS /tmp and some NFS > mounts, everything on my system is ZFS. > > I believe vfs.bufspace is what shows up as "Buf" on top? I don't > recall it looking particularly interesting when things were madly > swapping. I'll uncork arc_max again for a bit and see if anything odd > shows up in it, but it's only a dozen megs or so now. You are right. I forgot that it was in top and didn't notice. What I believe I need most is for someone to bisect a few revisions to let me know if it was one of my two major patches. Thanks, Jeff > > > > -- > Matthew Fuller (MF4839) | fullermd@over-yonder.net > Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ > On the Internet, nobody can hear you scream. >
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