From: "Benoît Canet" <benoit.canet@irqsave.net>
To: dietmar@proxmox.com
Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH v3 0/8] block: drive-backup live backup command
Date: Mon, 2 Sep 2013 14:57:23 +0200 [thread overview]
Message-ID: <20130902125722.GG5073@irqsave.net> (raw)
I don't see the point of using hashes.
Using hashes means that at least one extra read will be done on the target to
compute the candidate target hash.
It's bad for a cloud provider where IOs count is a huge cost.
Another structure to replace a bitmap (smaller on the canonical case) would be
a block table as described in the Hystor paper:
www.cse.ohio-state.edu/~fchen/paper/papers/ics11.pdf
Best regards
Benoît
next reply other threads:[~2013-09-02 12:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-02 12:57 Benoît Canet [this message]
2013-09-03 7:54 ` [Qemu-devel] [PATCH v3 0/8] block: drive-backup live backup command Stefan Hajnoczi
-- strict thread matches above, loose matches on Subject: below --
2013-05-15 14:34 Stefan Hajnoczi
2013-05-16 6:16 ` Wenchao Xia
2013-05-16 7:47 ` Stefan Hajnoczi
2013-05-17 6:58 ` Wenchao Xia
2013-05-17 9:14 ` Stefan Hajnoczi
2013-05-21 3:25 ` Wenchao Xia
2013-05-21 7:34 ` Stefan Hajnoczi
2013-05-17 10:17 ` Paolo Bonzini
2013-05-20 6:24 ` Stefan Hajnoczi
2013-05-20 7:23 ` Paolo Bonzini
2013-05-21 7:31 ` Stefan Hajnoczi
2013-05-21 8:30 ` Paolo Bonzini
2013-05-21 10:34 ` Stefan Hajnoczi
2013-05-21 10:36 ` Paolo Bonzini
2013-05-21 10:58 ` Dietmar Maurer
2013-05-22 13:43 ` Stefan Hajnoczi
2013-05-22 15:10 ` Dietmar Maurer
2013-05-22 15:34 ` Dietmar Maurer
2013-05-23 8:04 ` Stefan Hajnoczi
2013-05-23 8:11 ` Dietmar Maurer
2013-05-24 8:38 ` Stefan Hajnoczi
2013-05-24 9:53 ` Dietmar Maurer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130902125722.GG5073@irqsave.net \
--to=benoit.canet@irqsave.net \
--cc=dietmar@proxmox.com \
--cc=pbonzini@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=stefanha@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).