From: Kevin Wolf <kwolf@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Chunqiang Tang <ctang@us.ibm.com>,
Markus Armbruster <armbru@redhat.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: Strategic decision: COW format
Date: Tue, 22 Feb 2011 17:15:56 +0100 [thread overview]
Message-ID: <4D63E13C.4090705@redhat.com> (raw)
In-Reply-To: <4D63DCD6.50801@codemonkey.ws>
Am 22.02.2011 16:57, schrieb Anthony Liguori:
> On 02/22/2011 02:56 AM, Kevin Wolf wrote:
>>
>> *sigh*
>>
>> It starts to get annoying, but if you really insist, I can repeat it
>> once more: These features that you don't need (this is the correct
>> description for what you call "misfeatures") _are_ implemented in a way
>> that they don't impact the "normal" case.
>
> Except that they require a refcount table that adds additional metadata
> that needs to be updated in the fast path. I consider that impacting
> the normal case.
Like it or not, this requirement exists anyway, without any of your
"misfeatures".
You chose to use the dirty flag in QED in order to avoid having to flush
metadata too often, which is an approach that any other format, even one
using refcounts, can take as well.
Kevin
next prev parent reply other threads:[~2011-02-22 16:16 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OF3C9DAE9F.EC6B5878-ON85257826.00715C10-85257826.007A14FB@LocalDomain>
2011-02-15 19:45 ` [Qemu-devel] Re: Comparing New Image Formats: FVD vs. QED Chunqiang Tang
2011-02-16 12:34 ` Kevin Wolf
2011-02-17 16:04 ` Chunqiang Tang
2011-02-18 9:12 ` Strategic decision: COW format (was: [Qemu-devel] Re: Comparing New Image Formats: FVD vs. QED) Markus Armbruster
2011-02-18 9:57 ` [Qemu-devel] Re: Strategic decision: COW format Kevin Wolf
2011-02-18 14:20 ` Anthony Liguori
2011-02-22 8:37 ` Markus Armbruster
2011-02-22 8:56 ` Kevin Wolf
2011-02-22 10:21 ` Markus Armbruster
2011-02-22 15:57 ` Anthony Liguori
2011-02-22 16:15 ` Kevin Wolf [this message]
2011-02-22 18:18 ` Anthony Liguori
2011-02-23 9:13 ` Kevin Wolf
2011-02-23 14:21 ` Anthony Liguori
2011-02-23 14:55 ` Kevin Wolf
2011-02-23 13:43 ` Avi Kivity
2011-02-23 14:23 ` Anthony Liguori
2011-02-23 14:38 ` Kevin Wolf
2011-02-23 15:29 ` Anthony Liguori
2011-02-23 15:36 ` Avi Kivity
2011-02-23 15:47 ` Anthony Liguori
2011-02-23 15:59 ` Avi Kivity
2011-02-23 15:54 ` Kevin Wolf
2011-02-23 15:23 ` Avi Kivity
2011-02-23 15:31 ` Anthony Liguori
2011-02-23 15:37 ` Avi Kivity
2011-02-23 15:50 ` Anthony Liguori
2011-02-23 16:03 ` Avi Kivity
2011-02-23 16:04 ` Anthony Liguori
2011-02-23 16:15 ` Kevin Wolf
2011-02-25 11:20 ` Pavel Dovgaluk
[not found] ` <-1737654525499315352@unknownmsgid>
2011-02-25 13:22 ` Stefan Hajnoczi
2011-02-23 15:52 ` Anthony Liguori
2011-02-23 15:59 ` Gleb Natapov
2011-02-23 16:00 ` Avi Kivity
2011-02-23 15:33 ` Daniel P. Berrange
2011-02-23 15:38 ` Avi Kivity
2011-02-18 17:43 ` Stefan Weil
2011-02-18 19:11 ` Kevin Wolf
2011-02-18 19:47 ` Anthony Liguori
2011-02-18 20:49 ` Kevin Wolf
2011-02-18 20:50 ` Anthony Liguori
2011-02-18 21:27 ` Kevin Wolf
2011-02-19 17:19 ` Stefan Hajnoczi
2011-02-18 20:31 ` Anthony Liguori
2011-02-19 12:27 ` [Qemu-devel] Bugs in the VDI Block Device Driver Chunqiang Tang
2011-02-19 16:21 ` Stefan Hajnoczi
2011-02-19 18:49 ` Stefan Weil
2011-02-20 22:13 ` [Qemu-devel] Re: Strategic decision: COW format Aurelien Jarno
2011-02-21 8:59 ` Kevin Wolf
2011-02-21 13:44 ` Stefan Hajnoczi
2011-02-21 14:10 ` Kevin Wolf
2011-02-21 15:16 ` Anthony Liguori
2011-02-21 15:26 ` Kevin Wolf
2011-02-23 3:32 ` Chunqiang Tang
2011-02-23 13:20 ` Markus Armbruster
[not found] ` <OFAEB4CD91.BE989F29-ON8525783F.007366B8-85257840.00130B47@LocalDomain>
2011-03-13 5:51 ` Chunqiang Tang
2011-03-13 17:48 ` Anthony Liguori
2011-03-14 2:28 ` Chunqiang Tang
2011-03-14 13:22 ` Anthony Liguori
2011-03-14 13:53 ` Chunqiang Tang
2011-03-14 14:02 ` Anthony Liguori
2011-03-14 14:21 ` Kevin Wolf
2011-03-14 14:35 ` Chunqiang Tang
2011-03-14 14:49 ` Anthony Liguori
2011-03-14 15:05 ` Stefan Hajnoczi
2011-03-14 15:08 ` Kevin Wolf
2011-03-14 14:26 ` Stefan Hajnoczi
2011-03-14 14:30 ` Chunqiang Tang
2011-03-14 14:15 ` Kevin Wolf
2011-03-14 14:25 ` Chunqiang Tang
2011-03-14 14:31 ` Stefan Hajnoczi
2011-03-14 16:32 ` Chunqiang Tang
2011-03-14 17:57 ` Kevin Wolf
2011-03-14 19:23 ` Chunqiang Tang
2011-03-14 20:16 ` Kevin Wolf
[not found] ` <OF7C2FDD40.E76A4E14-ON85257853.005ADD68-85257853.005AF16E@LocalDomain>
2011-03-14 21:32 ` Chunqiang Tang
2011-03-14 14:34 ` Kevin Wolf
2011-03-14 14:47 ` Anthony Liguori
2011-03-14 15:03 ` Kevin Wolf
2011-03-14 15:13 ` Anthony Liguori
2011-03-14 15:04 ` Chunqiang Tang
2011-03-14 15:07 ` Stefan Hajnoczi
2011-03-14 10:12 ` Kevin Wolf
2011-02-22 8:40 ` Markus Armbruster
2011-02-16 13:21 ` [Qemu-devel] Re: Comparing New Image Formats: FVD vs. QED Stefan Hajnoczi
2011-02-17 16:04 ` Chunqiang Tang
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