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Re: [libvirt] Virt io blk buffer

On 02/23/2012 11:53 PM, Pankaj Rawat wrote:
> Hi all 
> Can any one tell what is the default Vitio blk IO Buffer size 

You'll probably get better response on the qemu lists, since virtio is
part of qemu.

> And can we change it ? if yes how?

Libvirt does not currently expose anything to change this, other than
the fact that _if_ qemu supports a way to change it on the command line,
you can use <qemu:command> in your XML to add the extra arguments; or if
qemu supports it via a monitor command, you can use 'virsh
qemu-monitor-command' to change it at runtime.  But again, I don't know
enough about the situation to know if qemu even exposes a
parameterizable block size for virtio, since no one has previously asked
for libvirt to start encoding it into its XML as a formal feature.

> The contents of this e-mail and any attachment(s) are confidential and

Disclaimers like this are unenforceable when posting to publicly
archived lists, and it is considered poor netiquette to leave them in.
I'd recommend sending from a private personal account if your employer
insists on adding this garbage to your mail from work.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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