[Gllug] Hardware problems / good replacements
phil-gllug at tinsleyviaduct.com
Sat Feb 11 18:47:06 UTC 2012
On 11/02/12 12:00, Richard W.M. Jones wrote:
> I'm surprised that a BIOS update made any difference. I wasn't aware
> that virtualization extensions could be disabled on AMD; on Intel it
> is (or used to be) a problem that virtualization would be disabled by
> the BIOS and couldn't be reenabled, requiring a BIOS update or even a
> replacement motherboard to rectify. Perhaps the BIOS update just
> fixed some clock speed or memory settings, making the machine
> generally faster.
Well, it could be switched off, but to my knowledge it was always on.
> It's academic now, but before the BIOS update did you check the
> obvious stuff; all cores enabled? core speed? BogoMIPS? memory
> settings set for maximum performance ...?
Checked the lot - if anything, attempting to improve performance made it
>>> The second problem is Debian squeeze ... because it's old. Using the
>>> latest kernel, qemu-kvm and libvirt should yield significantly better
>> I tried a later qemu-kvm... it didn't seem to make much difference on
>> what I could actually get it to do at the time. I will try it again
>> fairly soon, if this problem persists.
> You need to upgrade the whole stack, from kernel up through userspace
> tools. This needs coordination from all components.
I will consider that before expecting miracles. If I recall correctly,
libvirt was the most daunting to deal with.
> Also check that KVM is actually being used. You should see the
> 'kvm_amd' module is loaded, and there should be no warnings or errors
> in 'dmesg' about virtualization being disabled.
That was the first thing I checked. Nothing ever appeared to be going
wrong with it.
mail: phil-gllug at tinsleyviaduct.com
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