Date: Fri, 6 Apr 2018 11:08:14 -0400 From: Mark Johnston <markj@freebsd.org> To: Justin Hibbits <chmeeedalf@gmail.com> Cc: Jeff Roberson <jroberson@jroberson.net>, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT Message-ID: <20180406150814.GB10017@raichu> In-Reply-To: <CAHSQbTBjs=5Nq-QGZftYh8rDwMuCZN7CrsLt0OPPOyzW2V6_Ow@mail.gmail.com> References: <alpine.BSF.2.21.1803111038460.1232@desktop> <20180320070745.GA12880@server.rulingia.com> <2b3db2af-03c7-65ff-25e7-425cfd8815b6@FreeBSD.org> <1fd2b47b-b559-69f8-7e39-665f0f599c8f@FreeBSD.org> <tkrat.9bab32187c0e8d01@FreeBSD.org> <tkrat.11e402b8455bd0fa@FreeBSD.org> <tkrat.7e60fe1978ea51c0@FreeBSD.org> <20180404174949.GA12271@raichu> <tkrat.5960d3aa016999f6@FreeBSD.org> <CAHSQbTBjs=5Nq-QGZftYh8rDwMuCZN7CrsLt0OPPOyzW2V6_Ow@mail.gmail.com>
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On Fri, Apr 06, 2018 at 12:47:14AM +0000, Justin Hibbits wrote: > My powerpc64 embedded machine is virtually unusable since these vm changes. > I tried setting vfs.zfs.arc_free_target as suggested, and that didn't help > at all. Eventually the machine hangs and just gets stuck in vmdaemon, with > many processes in wait channel btalloc. You don't really have the same symptoms that Don is reporting. Threads being stuck in btalloc implies a KVA shortage. So: - What do you mean by "stuck in vmdaemon"? - Which commits specifically cause problems? Does reverting r329882 fix the hang? - Can you break to DDB and get "show page" output when the hang occurs? - What is the system doing to cause the hang to occur?
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