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Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU
From: |
Ryan Harper |
Subject: |
Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU |
Date: |
Tue, 14 Oct 2008 09:32:54 -0500 |
User-agent: |
Mutt/1.5.6+20040907i |
* Kevin Wolf <address@hidden> [2008-10-14 05:10]:
> Ryan Harper schrieb:
> > * Laurent Vivier <address@hidden> [2008-10-13 13:52]:
> >> What file type do you use (qcow2, raw ?).
> >
> > Raw.
>
> I guess the image is preallocated? What about sparse files (or qcow2,
> anything that grows), do have numbers on those? In the past, I
> experienced O_DIRECT to be horribly slow on them.
>
> Well, looking at your numbers, they _are_ quite bad, so maybe it
> actually was sparse. Then the preallocated case would be interesting.
It was pre-allocated. I'm incliding to think there is an alignment or
some sort of bug/edge-case in the write path to the file on top of the
lvm volume considering I don't see such horrible performance against the
file in host via O_DIRECT. I imagine until I figure out the issue,
sparse or preallocated will perform the same.
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
address@hidden
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, (continued)
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Ryan Harper, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Ryan Harper, 2008/10/13
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/15
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/16
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Anthony Liguori, 2008/10/16
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/16
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/17
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Laurent Vivier, 2008/10/17
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Kevin Wolf, 2008/10/14
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU,
Ryan Harper <=
- Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/14
Re: [Qemu-devel] Re: [RFC] Disk integrity in QEMU, Mark Wagner, 2008/10/13
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Rik van Riel, 2008/10/13
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Ian Jackson, 2008/10/28