3:10 p.m.
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From: Sven Kieske <s.kieske(a)mittwald.de>
To: devel(a)ovirt.org
Message-ID: <918b520b-176c-3a09-d7c9-a16340ac6480(a)mittwald.de>
Subject: Re: [ovirt-devel] VDSM changes Linux memory dirty ratios - why?
References: <CAJgorsbMk1UeLt82GOWsVKOmj=Kse+4CvhoT2E_kj=PUnhG28A(a)mail.gmail.com>
<20161130074847.GA1215(a)dhcp130-218.brq.redhat.com>
In-Reply-To: <20161130074847.GA1215(a)dhcp130-218.brq.redhat.com>
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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"
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I wonder why virtual-host tuned profile doesn't contain these values:
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$ grep vm.dirty /usr/lib/tuned/virtual-host/tuned.conf
vm.dirty_background_ratio =3D 5
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[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
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usen
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