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Re: [Xen-users] blktap vs qemu backend

  • To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Matthias Blankenhaus <matthiasblankenhaus@xxxxxxxxx>
  • Date: Sun, 23 Sep 2012 20:52:04 -0700 (PDT)
  • Cc: Kristoffer Harthing Egefelt <k@xxxxxxx>
  • Delivery-date: Mon, 24 Sep 2012 03:52:43 +0000
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  • List-id: Xen user discussion <xen-users.lists.xen.org>

Hi Kristoffer !

Did you get a reply for this ? I am very interested in the future of the block device layer as well.


From: Kristoffer Harthing Egefelt <k@xxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Tuesday, September 4, 2012 7:23 AM
Subject: [Xen-users] blktap vs qemu backend


I'm trying to figure out if blktap or qemu is the best backend for raw

Using xen4.2 and kernel 3.2 and 3.5 theres a lot of problems with blktap,
hacking blktap, hanging devices, unbootable domUs (block device errors).

Performance in the qemu backend actually seems to be quite ok, 5-20% slower
than LVM though - but not that much slower than blktap.

It seems that a userspace blktap3 is not coming soon
(http://lists.xen.org/archives/html/xen-devel/2012-04/msg00583.html) so
maybe one should just settle with qemu for now.

- Anybody know where the source code for blktap3 is?
- xl top does not show VBD stats for qemu devices - is this expected?


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