if you’re unable to install the broadcom sta driver on ubuntu 11.04… we have the answer

if you’re unable to install the broadcom sta driver on ubuntu 11.04, fire up synaptic and reinstall bcmwl-kernel-source

2011-04-29 18:29:50,089 WARNING: /sys/module/wl/drivers does not exist, cannot rebind wl driver

it should work now 🙂

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Comparing Linux huge memory pages & Kernel Samepage Merging for KVM virtualization

A quick test (so take it with a grain of salt):

  1. Huge pages is slightly faster than not using huge pages (~10% with 4 winxp virtual machines copying 512MB from one memory location to another).
  2. KSM is slightly slower then not using KSM (~5% with 4 winxp virtual machines copying 512MB from one memory location to another).

So, at first glance it would appear that we can use a loose rule of thumb:

  1. to consolidate the maximum number of machines, use KSM as it will allow you to over commit the amount of memory on your box.
    1. Risk: if the memory pages are significantly different, you may start swapping in a very bad way. This is where monitoring comes in
  2. to give the best performance to a number of machines, use huge memory pages.. does not allow you to over commit
    1. Risk: if you don’t leave enough memory for the host os, you can crash your machine. This is also where monitoring comes in
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Proxmox VE 1.8 and KVM: Adding sound to your virtual machines!

This assumes that your host machine has a sound card! 🙂

Add the args line in your /etc/qemu-server/<vm id>.conf file should give you sound:

args: -soundhw

On my Proxmox VE 1.8, I have several virtual audio devices available.   I’ve had the best luck with ac97 with Windows XP/Vista and Win7.

red:/etc/qemu-server# kvm -soundhw ‘?’
Valid sound card names (comma separated):
pcspk       PC speaker
sb16        Creative Sound Blaster 16
ac97        Intel 82801AA AC97 Audio
es1370      ENSONIQ AudioPCI ES1370
hda         Intel HD Audio

-soundhw all will enable all of the above

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