Public bug reported:
I recently started up a lubuntu livecd under a Xen vm on my 16.04 Xen
server to do some testing. You never even see the LILO menu, and after
4 minutes 30 seconds, you finally see the desktop. The guest also
reports CPU soft lockup errors because the lag is so bad.
I first tried reverting to an older kernel ( 4.10 ) that did not have
the recent spectre/meltdown patches to no avail. I noticed that during
this time on the dom0, qemu-system-x86 is using 100% of a cpu. I
noticed qemu recently had a set of spectre/meltdown patches so I
downgraded it back to 1:2.5+dfsg-5ubuntu10 and suddenly I was able see
the LILO menu within one or two seconds, select from it, and get a
desktop maybe 15 seconds after that.
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1752375
Title:
Massive performance regression caused by recent spectre/meltdown
patches
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