On 30/11/16 13:10 +0100, Sven Kieske wrote:
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!
Sorry, I've totally missed the fact it's internal link (unfortunately publicly visible on the BZ). I believe it's slightly outdated, but let's ask the author. Ben, is the document[2] somehow still valid and could it be made publicly available? Re-referencing for completeness: [2]http://perf1.lab.bos.redhat.com/bengland/laptop/rhev/rhev-vm-rsptime.pdf
-- Mit freundlichen Grüßen / Regards
Sven Kieske
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