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From: | Laine Stump |
Subject: | Re: [Qemu-devel] [Bug 524447] Re: virsh save is very slow |
Date: | Tue, 15 Jun 2010 16:30:30 +0300 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-3.fc13 Thunderbird/3.0.4 |
Bug description: As reported here: http://www.redhat.com/archives/libvir-list/2009-December/msg00203.html "virsh save" is very slow - it writes the image at around 1MB/sec on my test system. (I think I saw a bug report for this issue on Fedora's bugzilla, but I can't find it now...)
Here's the Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=599091Note that I've already pushed a patch upstream that fixes the problem (reduces save time for a 512MB guest from 3:47 to 0:56), and eric Blake has posted a more refined patch that wastes less space by invoking dd twice (once for libvirt's header, and again for the image) - that hasn't been pushed yet, but will almost definitely supercede my patch before the libvirt-0.8.2 release.
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