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Re: [Qemu-devel] PVFS2 Block Driver Support
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] PVFS2 Block Driver Support |
Date: |
Thu, 27 Jun 2013 16:43:17 +0200 |
On Thu, Jun 27, 2013 at 4:25 PM, Timothy Scott <address@hidden> wrote:
> I am working on adding block driver support for PVFS2 that will allow images
> stored on PVFS2 systems to bypass the kernel module and hopefully improve
> performance significantly.
What performance bottlenecks are you seeing in the kernel which you
can bypass from QEMU userspace?
> Can you please advise on a couple of issues:
> - Should qcow2 and other optimizing formats function when using pvfs2 as a
> transport/block layer? ie 'qemu-img create -f qcow2 pvfs2:foo.img 10g'
qcow2 works on top of any "protocol" and it should work on top of
PVFS2. QED does not and other formats may or may not (VHDX, VMDK,
etc).
> - Are there any debugging tools or compile flags that are recommended for
> use in QEMU? I am currently hacking around with gdb and having trouble
> navigating through much of the code.
You may find trace events useful, see docs/tracing.txt.
> - Is there currently a testing suite/procedure for verifying new block
> drivers?
There is a test suite in tests/qemu-iotests/. You will need to add
support for PVFS2, see how NBD and other protocols were added.
Stefan