20.09.2010 14:58, Harald Staub wrote: > Package: qemu-kvm > Version: 0.12.5+dfsg-3 > Severity: grave > > I started some testing of the version of qemu-kvm of squeeze. I do this > on a lenny box, with a sid kernel (linux-image-2.6.32-5-amd64 2.6.32-23) > and backports of qemu-kvm and libvirt (0.8.3-1). > > I found that to save a VM (through virsh save) is really slow. A VM with > 128MB RAM took 40 to 50 seconds. This makes it unusable not only for me > (see launchpad bug link below, comment #3). > > With the following patch applied, it looks ok (save takes about 1 second): > http://lists.nongnu.org/archive/html/qemu-devel/2010-07/msg00431.html > > The patch applies cleanly after having replaced DPRINTF with dprintf. > > I found this patch through > https://bugs.launchpad.net/qemu/+bug/524447
Thank you Harald for the bugreport that includes patch. I missed that change when it were committed. The problem with slow migration bothered me for quite some time, I've seen this thread on LP too, I argued with Anthony Liguori against his dd buffer size suggestion. But it was several months ago, while the fix is relatively recent. You just connected all the ends together - thank you for this. I verified the change (it's commit 5e77aaa0d7d2f4ceaa4fcaf50f3a26d5150f34a6 upstream) and it appears to be correct for 0.12 branch too. I already included it for the next debian release, if such a release will happen for squeeze (due to feature freeze). Now, I'm questioning the severity you've choosen for this bug. "Grave" is release-critical, when a package "breaks for most users". I don't think many users uses migration, and no kvm package in any stable debian series included working migration code. It might be "important" if you really think it _is_ important, but grave? Why? > I wonder why this was not included in upstream 0.12.5 ... Very few people cares about 0.12 as a whole. Speaking of 0.12.5 -- well, there were a few changes that probably should be there too, but aren't. Some of them are in debian package. /mjt -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
