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Re: [Qemu-devel] Windows slow boot
From: |
Michael Tokarev |
Subject: |
Re: [Qemu-devel] Windows slow boot |
Date: |
Tue, 18 Sep 2012 19:12:40 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux i686 on x86_64; rv:10.0.6esrpre) Gecko/20120817 Icedove/10.0.6 |
On 16.08.2012 14:47, Richard Davies wrote:
> http://marc.info/?l=qemu-devel&m=134304194329745
>
>
> We have been experiencing this problem for a while now too, using qemu-kvm
> (currently at 1.1.1).
>
> Unfortunately, hv_relaxed doesn't seem to fix it. The following command line
> produces the issue:
>
> qemu-kvm -nodefaults -m 4096 -smp 8 -cpu host,hv_relaxed -vga cirrus
> -usbdevice tablet -vnc :99 -monitor stdio -hda test.img
Just one question: did you try explicitly using hugepages?
For that,
- reserve some amount of hugepages (echo something >
/proc/sys/vm/nr_hugepages),
- mount hugetlbfs to somewhere, like, /dev/hugetlbfs
- use -mem-path=/dev/hugetlbfs qemu option
This may also reduce your lock contention. Sure, hugepages have
some minus sides too, but I think it is worth to try anyway -
for a single VM or for whole lot of VMs (for that you'll have
to reserve much more memory after host boot).
/mjt
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