Date: Sat, 7 Apr 2018 14:59:14 -0500 From: Justin Hibbits <chmeeedalf@gmail.com> To: Don Lewis <truckman@freebsd.org> Cc: Mark Johnston <markj@freebsd.org>, Jeff Roberson <jroberson@jroberson.net>, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT Message-ID: <CAHSQbTBqg3oh1WEn=X=sTpfYN9WGE17fc9TJ=6RPt-EO5ttAEQ@mail.gmail.com> In-Reply-To: <tkrat.282ffd016285f8c7@FreeBSD.org> 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> <20180406150814.GB10017@raichu> <CAHSQbTCGmw5-_b1VJn6iotYovfDdPZ6RDC1pT9%2B9J=7%2BGzD=%2Bg@mail.gmail.com> <CAHSQbTA0kgzB6tLV9Zn7gU5wxfURddatekP8Cy9G5hKLkb1ckw@mail.gmail.com> <tkrat.282ffd016285f8c7@FreeBSD.org>
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Hi Don, > I initially missed that this was on powerpc. I believe that arch is a > bit odd with characters unsigned by default and arithmentic shifts > always being unsigned. Things like that could mess up the algorithm, > but I didn't see anything suspicious in the r329882 diff. I think the biggest difference for powerpc64 vs amd64 in this case is the (currently) relatively small KVA (7.5GB vs 2(?) TB). That might make a difference regarding VM pageout calculations. - Justin
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