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
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