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Issues when running Hurd under KVM: un-synced filesystems, etc.  No problems
with Virtualbox.

2010-07-28, #hurd

    <youpi> pochu: you were the one reporting issues with qemu/kvm and hurd, right?
    <youpi> is your machine somehow smp (like multicore for instance)
    <youpi> ?
    <pochu> youpi: yes, it's a Core 2 Duo
    <pochu> so 2 cores
    <youpi> ok, you might want to try to bind qemu/kvm
    <youpi> e.g. install hwloc, and prepend "hwloc-bind 1 --" before the qemu/kvm command line 
    <pochu> ok, ty

2010-07-31, GNU Mach commit 039176372b4271f370ef38eb2ee5d43923a5b28b.

# KVM-on-KVM (nested KVM)

This seems sluggish like hell. jenkins.debian.net suffers badly from it: it
takes like an hour to complete the "Loading additional components" step.

It's actually slower than just running qemu-on-KVM.

This doesn't happen with Linux L2 guests.

Date: Tue, 11 Nov 2014
https://www.mail-archive.com/kvm@vger.kernel.org/msg109570.html