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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: |
Mon, 13 Oct 2008 14:15:28 -0500 |
User-agent: |
Mutt/1.5.6+20040907i |
* Mark Wagner <address@hidden> [2008-10-13 14:06]:
> Ryan Harper wrote:
>
> Can you please post the details of the guest and host configurations.
http://lists.gnu.org/archive/html/qemu-devel/2008-09/msg01115.html
> From seeing kvm write data that is greater than that of bare metal,
> I would think that your test dataset is too small and not
> exceeding that of the host cache size.
The size was chosen so it would fit in to demonstrate the crazy #'s seen
on cached writes without O_DSYNC.
>
> Our previous testing has shown that once you exceed the host cache
> and cause the cache to flush, performance will drop to a point lower
> than if you didn't use the cache in the first place.
>
> Can you repeat the tests using a data set that is 2X the size of your
> hosts memory and post the results for the community to see?
Yeah, I can generate those numbers as well. Seeing your note about tons
of ESA and storage, feel free to generate your own #'s and post them for
the community as well; the more the merrier.
--
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, 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, 2008/10/14
- 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