Re: [Xen-devel] RFC: blktap3

[Thanos Makatos <thanos.makatos@xxxxxxxxxx>]

I haven't yet looked at the code in depth, but I suppose blktap3 can, in some 
cases, be faster than blktap2 since the dom0 kernel doesn't participate in the 
data path. At least that's what I'd expect
;-).

-----Original Message-----
From: Goncalo Gomes 
Sent: 09 August 2012 22:40
To: Thanos Makatos
Cc: xen-devel@xxxxxxxxxxxxx
Subject: Re: [Xen-devel] RFC: blktap3

On Thu, 09 Aug 2012, Thanos Makatos wrote:

> Hi,
> 
> Iâd like to introduce blktap3: essentially blktap2 without the need of 
> blkback. This has been developed by Santosh Jodh, and Iâll maintain it.

Welcome! precisely, xenio (aka blktap3) was developed by Daniel Stodden and 
recently continued/improved by Santosh Jodh :-)

As I have a slight interest in this area, I was wondering what are the main 
improvements over blktap2?

Goncalo

> In this patch, blktap2 binaries are suffixed with â2â, so itâs not yet 
> possible to use it along with blktap3.
> 
> An example configuration file I used is the following:
> name = "debian bktap3 without pygrub"
> memory = 256
> disk = 
> ['backendtype=xenio,format=vhd,vdev=xvda,access=rw,target=/root/debian
> -blktap3.vhd']
> kernel = "vmlinuz-2.6.32-5-amd64"
> root = '/dev/xvda1'
> ramdisk = "initrd.img-2.6.32-5-amd64"
> cpu_weight=256
> vif=['bridge=xenbr0']
> 
> Before starting any blktap3 VM, the xenio daemon must be started.
> 
> Iâve tested it on change set 472fc515a463 without pygrub.
> 
> Any comments are welcome :)
> 
> --
> Thanos Makatos
> 


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