Date: Fri, 23 Mar 2018 16:21:32 -0700 From: Bryan Drewery <bdrewery@FreeBSD.org> To: Peter Jeremy <peter@rulingia.com>, Jeff Roberson <jroberson@jroberson.net> Cc: FreeBSD current <freebsd-current@freebsd.org>, Andriy Gapon <avg@freebsd.org> Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT Message-ID: <2b3db2af-03c7-65ff-25e7-425cfd8815b6@FreeBSD.org> In-Reply-To: <20180320070745.GA12880@server.rulingia.com> 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> <20180320070745.GA12880@server.rulingia.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --peWEmISJWwMj6HfJfKeabFgfjpj5pPoKJ Content-Type: multipart/mixed; boundary="5GZut2mJLg1mrfnwTYoP0tu2JTHyJjIKx"; protected-headers="v1" From: Bryan Drewery <bdrewery@FreeBSD.org> To: Peter Jeremy <peter@rulingia.com>, Jeff Roberson <jroberson@jroberson.net> Cc: FreeBSD current <freebsd-current@freebsd.org>, Andriy Gapon <avg@freebsd.org> Message-ID: <2b3db2af-03c7-65ff-25e7-425cfd8815b6@FreeBSD.org> Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT 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> <20180320070745.GA12880@server.rulingia.com> In-Reply-To: <20180320070745.GA12880@server.rulingia.com> --5GZut2mJLg1mrfnwTYoP0tu2JTHyJjIKx Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 3/20/2018 12:07 AM, Peter Jeremy wrote: >=20 > On 2018-Mar-11 10:43:58 -1000, Jeff Roberson <jroberson@jroberson.net> = wrote: >> Also, if you could try going back to r328953 or r326346 and let me kno= w if=20 >> the problem exists in either. That would be very helpful. If anyone = is=20 >> willing to debug this with me contact me directly and I will send some= =20 >> test patches or debugging info after you have done the above steps. >=20 > I ran into this on 11-stable and tracked it to r326619 (MFC of r325851)= =2E > I initially got around the problem by reverting that commit but either > it or something very similar is still present in 11-stable r331053. >=20 > I've seen it in my main server (32GB RAM) but haven't managed to reprod= uce > it in smaller VBox guests - one difficulty I faced was artificially fil= ling > ARC. >=20 Looking at the ARC change you referred to from r325851 https://reviews.freebsd.org/D12163, I am convinced that ARC backpressure is completely broken. On my 78GB RAM system with ARC limited to 40GB and doing a poudriere build of all LLVM and GCC packages at once in tmpfs I can get swap up near 50GB and yet the ARC remains at 40GB through it all. It's always been slow to give up memory for package builds but it really seems broken right now. --=20 Regards, Bryan Drewery --5GZut2mJLg1mrfnwTYoP0tu2JTHyJjIKx-- --peWEmISJWwMj6HfJfKeabFgfjpj5pPoKJ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBAgAGBQJatYwAAAoJEDXXcbtuRpfPYtUIAJUKx7TLrDXkpSTY1l/FNHz7 CMgOFqck5sYz3x5M4vklwc3yCvCKofI2EPlHg4NEvkOzgYHDOdidaMrbZMDFC4L0 8vm5gWdXtPstMH+IP8QSENgBfh2nUAWxLKSFtKYLTBoQKCdig3HYc/Saf5rcfbrO t7f6Kesz/1B+beS/IWBicuWxuwAw86Ex+uIYE1b10O0/jwY3WOWM3THOT28rAixL 7c7kgXFXEzJw+7qYmuxguE7P0C0kwPd2zxDhaKNzIbyggTu+8QRpPhy5oVW3TDWP mmlvUfZAd9GRD41fv3ZtXMwURQV6fx5ApONwaf31EJi/mJVqHSPR3A5JdRWW76c= =VjMH -----END PGP SIGNATURE----- --peWEmISJWwMj6HfJfKeabFgfjpj5pPoKJ--
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