From: Tim Deegan <tim@xen.org>
To: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Cc: Ian Campbell <ian.campbell@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
"Xen-devel@lists.xen.org" <Xen-devel@lists.xen.org>,
David Vrabel <david.vrabel@citrix.com>
Subject: Re: Domain Save Image Format proposal (draft B)
Date: Wed, 12 Feb 2014 16:34:40 +0100 [thread overview]
Message-ID: <20140212153440.GC91459@deinos.phlegethon.org> (raw)
In-Reply-To: <CAP8mzPNrDNOC=nsOTGbowfm5uku30NvEZsVdia4VwZ6eFhMe-Q@mail.gmail.com>
At 22:12 -0600 on 10 Feb (1392066773), Shriram Rajagopalan wrote:
> My point here being, checksums seem like unnecessary compute overhead when
> doing live migration
> or Remus. One can simply set this field to 0 when doing live
> migration/Remus.
Remus _compresses_ the payload, right? CRC32 is basically free
compared to that.
But I think the point about checksumming the whole image is sound.
That will catch _more_ classes of corruption than a per-block data
checksum, and the class of bugs caught by per-block checksums (basically,
that the header and the data don't match for some reason) are pretty
small in this design.
Tim.
next prev parent reply other threads:[~2014-02-12 15:34 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-10 17:20 Domain Save Image Format proposal (draft B) David Vrabel
2014-02-10 17:32 ` Andrew Cooper
2014-02-10 17:48 ` Frediano Ziglio
2014-02-10 20:00 ` Shriram Rajagopalan
2014-02-11 1:35 ` Andrew Cooper
2014-02-11 4:12 ` Shriram Rajagopalan
2014-02-11 10:58 ` Zoltan Kiss
2014-02-12 15:34 ` Tim Deegan [this message]
2014-02-11 11:58 ` David Vrabel
2014-02-11 16:13 ` Shriram Rajagopalan
2014-02-11 9:30 ` Ian Campbell
2014-02-11 11:40 ` David Vrabel
2014-02-11 12:09 ` Ian Campbell
2014-02-11 13:10 ` Jan Beulich
2014-02-11 13:12 ` Ian Campbell
2014-02-12 15:41 ` Tim Deegan
2014-02-11 10:06 ` Jan Beulich
2014-02-11 13:04 ` David Vrabel
2014-02-11 13:20 ` Jan Beulich
2014-02-11 16:45 ` Ian Jackson
2014-02-11 17:08 ` Shriram Rajagopalan
2014-02-11 17:15 ` Ian Campbell
2014-02-11 17:30 ` Ian Jackson
2014-02-11 17:31 ` Frediano Ziglio
2014-02-11 17:53 ` Ian Jackson
2014-02-11 17:59 ` Ian Campbell
2014-02-12 9:07 ` Frediano Ziglio
2014-02-12 11:27 ` Frediano Ziglio
2014-02-12 11:34 ` Ian Campbell
2014-02-11 16:38 ` Ian Jackson
2014-02-11 17:04 ` Andrew Cooper
2014-02-11 17:07 ` Ian Jackson
2014-02-11 16:49 ` Ian Jackson
2014-02-11 17:10 ` David Vrabel
2014-02-11 17:28 ` Ian Jackson
2014-02-12 16:36 ` Tim Deegan
2014-02-12 17:09 ` David Vrabel
2014-02-12 18:16 ` Frediano Ziglio
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