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Re: [Qemu-devel] Re: Comparing New Image Formats: FVD vs. QED
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] Re: Comparing New Image Formats: FVD vs. QED |
Date: |
Wed, 16 Feb 2011 13:21:52 +0000 |
On Tue, Feb 15, 2011 at 7:45 PM, Chunqiang Tang <address@hidden> wrote:
>> Chunqiang Tang/Watson/IBM wrote on 01/28/2011 05:13:27 PM:
>> As you requested, I set up a wiki page for FVD at
> http://wiki.qemu.org/Features/FVD
>> . It includes a summary of FVD, a detailed specification of FVD, and a
>> comparison of the design and performance of FVD and QED.
>
>> See the figure at http://wiki.qemu.org/Features/FVD/Compare . This
> figure
>> shows that the file creation throughput of NetApp's PostMark benchmark
> under
>> FVD is 74.9% to 215% higher than that under QED.
File creation on a sparse image is currently limited by the fact that
the QED implementation serializes allocating writes. In earlier QED
patch series I had fine-grained metadata locking so allocating writes
scale better but that lead a regression on another benchmark. I have
this on my todo list.
This is an implementation-specific limitation and is unrelated to the
file format. It doesn't tell us about a difference between formats.
Stefan
- Re: [Qemu-devel] Bugs in the VDI Block Device Driver, (continued)
- Re: [Qemu-devel] Bugs in the VDI Block Device Driver, Stefan Weil, 2011/02/19
- Re: [Qemu-devel] Re: Strategic decision: COW format, Aurelien Jarno, 2011/02/20
- Re: [Qemu-devel] Re: Strategic decision: COW format, Kevin Wolf, 2011/02/21
- Re: [Qemu-devel] Re: Strategic decision: COW format, Stefan Hajnoczi, 2011/02/21
- Re: [Qemu-devel] Re: Strategic decision: COW format, Kevin Wolf, 2011/02/21
- Re: [Qemu-devel] Re: Strategic decision: COW format, Anthony Liguori, 2011/02/21
- Re: [Qemu-devel] Re: Strategic decision: COW format, Kevin Wolf, 2011/02/21
- Re: [Qemu-devel] Re: Strategic decision: COW format, Chunqiang Tang, 2011/02/22
- Re: [Qemu-devel] Re: Strategic decision: COW format, Markus Armbruster, 2011/02/23
- Re: [Qemu-devel] Re: Strategic decision: COW format, Markus Armbruster, 2011/02/22
Re: [Qemu-devel] Re: Comparing New Image Formats: FVD vs. QED,
Stefan Hajnoczi <=