--jqM3pA5AEqqKPdR1mpM0Heahc81JGL6Ve Content-Type: multipart/mixed; boundary="JmHWW6MUOGuane1dNFbNJhlcrxhH1obJ5"; protected-headers="v1" From: Sven Kieske <s.kieske@mittwald.de> To: devel@ovirt.org Message-ID: <918b520b-176c-3a09-d7c9-a16340ac6480@mittwald.de> Subject: Re: [ovirt-devel] VDSM changes Linux memory dirty ratios - why? References: <CAJgorsbMk1UeLt82GOWsVKOmj=Kse+4CvhoT2E_kj=PUnhG28A@mail.gmail.com> <20161130074847.GA1215@dhcp130-218.brq.redhat.com> In-Reply-To: <20161130074847.GA1215@dhcp130-218.brq.redhat.com> --JmHWW6MUOGuane1dNFbNJhlcrxhH1obJ5 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 30/11/16 08:48, Martin Polednik wrote:
It's not really irrelevant, the host still uses disk cache. Anyway, there is BZ[1] with a presentation[2] that (imho reasonably) states: =20 "Reduce dirty page limits in KVM host to allow direct I/O writer VMs to compete successfully with buffered writer processes for storage access" =20 I wonder why virtual-host tuned profile doesn't contain these values: =20 $ grep vm.dirty /usr/lib/tuned/virtual-host/tuned.conf vm.dirty_background_ratio =3D 5 =20 [1]https://bugzilla.redhat.com/show_bug.cgi?id=3D740887 [2]http://perf1.lab.bos.redhat.com/bengland/laptop/rhev/rhev-vm-rsptime= =2Epdf
Could you share [2] with the wider community? This would be awesome! --=20 Mit freundlichen Gr=FC=DFen / Regards Sven Kieske Systemadministrator Mittwald CM Service GmbH & Co. KG K=F6nigsberger Stra=DFe 6 32339 Espelkamp T: +495772 293100 F: +495772 293333 https://www.mittwald.de Gesch=E4ftsf=FChrer: Robert Meyer St.Nr.: 331/5721/1033, USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhause= n Komplement=E4rin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad Oeynha= usen --JmHWW6MUOGuane1dNFbNJhlcrxhH1obJ5-- --jqM3pA5AEqqKPdR1mpM0Heahc81JGL6Ve Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBAgAGBQJYPsG3AAoJEMby9TMDAbQRIgIQAJAoKRFa2S8zBCIPKDQQz8GL yFI7jrbveoxYoSzvUU/E+bIEaY1ZvltLjcGaVrqaRG9MAYKNqdGwRzIWqHg7/9dJ io2E5MO1sIUdwizMozuKobGspW4vpFVuWPpJfZdUt2fOQmZw0lEG8t3loUX9Mzu7 n96q+Zx52y32MrwDqkOZLXQsp9nEmySef0maz+36RWp/vyYyN3Yx1+WZcZe5CqSs UlnudfGczPVgu+lSi8utFw+C5sKGNaGn4TCswWpkihEvRiQtULJS5drEZRI3vJJP pqoWBVtPsbZFiGCL34LWpm8oawKI/7xYLwUY4X6YJ3WLwqM2fy6P95rIgR16nMoq GHkMLhkYb3IkfBquNVpJKc1mT7PAEtKyrbnSJ4mYLSbUIJ3aZZXIHRgTMJ1jcfHG P4f+khPmMieKeTc/tcWwUo8GEcF/v15se24iOXZKqzzR9H10Hk4jjLzFxhVDgamR 1RW2HoYrs6kyH+K4JwwsAtLX/Y7Kynu5A/q71FzlFjWuSVjjQ/TwWw88Hlplw9Ha 6FNlgzMFVz+L/AbxczrwDmLxphfYGHFxj8fbU7D7CVyJcdPsaRFCE57Ll1mCQm/g xAyPuRqqao4a16UmNvSrLYWX5unwsgF0KBTvKK49ktniis7wYbHgqbBIvm2tKY3j utQ+pz/rvDYLPskThwBn =jyJe -----END PGP SIGNATURE----- --jqM3pA5AEqqKPdR1mpM0Heahc81JGL6Ve--