Re: [Xen-users] loop versus tap?

["Todd Deshane" <deshantm@xxxxxxxxx>]

Hi Tom,

On Thu, May 29, 2008 at 8:51 PM, Tom Horsley <tom.horsley@xxxxxxx> wrote:

I noticed a vast improvement in stability and performance
when I replaced file: disk definitions with tap:aio:
in my virtual machines.

That is the purpose of the block tap driver.
 

I think file: uses the /dev/loopN mechanism (right?).

That's right. It's the loopback driver
 

Out of curiosity, could whatever underlying mechanism
(I have no idea what it is) that implements tap:aio
take the place of other uses of /dev/loopN on linux?

I will defer this one to someone else, but give you something
that explains all about the block tap driver:
http://www.usenix.org/event/usenix05/tech/general/full_papers/short_papers/warfield/warfield_html/

 

Cheers,
Todd
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