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[Qemu-discuss] qemu - cache=none / yet cache used?

From: Dan R
Subject: [Qemu-discuss] qemu - cache=none / yet cache used?
Date: Mon, 1 Aug 2016 14:53:29 -0400

For now, at least, I'm stuck with an old version of qemu-kvm

qemu is set as cache=none
I see that in libvirt and I see that doing a ps on qemu-kvm.

Yet, using "vmtouch" I see that (where ID is the real instance ID), to the matching disk:
it's using 29 GB of cache!

Why would that be? I could ask vmtouch to pull it out of cache, but I'm concerned whatever put it there in the first place, will put it back later..

I see this issue on multiple compute notes in two environments., I don't see this issue on the third environment.

(I'm using OpenStack IceHouse and also see /var/lib/nova/instances/_base is being cached )

Unfortunately, with all the caching, we end up going to swap...as opposed to taking items out of cache.


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