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: > > "Reduce dirty page limits in KVM host to allow > direct I/O writer VMs to compete successfully > with buffered writer processes for storage > access" > > I wonder why virtual-host tuned profile doesn't contain these values: > > $ grep vm.dirty /usr/lib/tuned/virtual-host/tuned.conf > vm.dirty_background_ratio = 5 > > [1]https://bugzilla.redhat.com/show_bug.cgi?id=740887 > [2]http://perf1.lab.bos.redhat.com/bengland/laptop/rhev/rhev-vm-rsptime.pdf
Could you share [2] with the wider community? This would be awesome! -- Mit freundlichen Grüßen / Regards Sven Kieske Systemadministrator Mittwald CM Service GmbH & Co. KG Königsberger Straße 6 32339 Espelkamp T: +495772 293100 F: +495772 293333 https://www.mittwald.de Geschäftsführer: Robert Meyer St.Nr.: 331/5721/1033, USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhausen Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad Oeynhausen
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