On Mon, May 11, 2020 at 10:12 AM Stefan Hajnoczi <stefa...@gmail.com> wrote: > On Sat, May 9, 2020 at 9:16 AM Xavier <1877...@bugs.launchpad.net> wrote: > > > > Public bug reported: > > > > On Arch Linux, the recent qemu package update seems to misbehave on some > > systems. In my case, my Windows 10 guest runs fine for around 5 minutes > > and then start to get really sluggish, even unresponsive. It needs to be > > forced off. I could reproduce this on a minimal VM with no passthrough, > > although my current testing setup involves an nvme pcie passthrough. > > > > I bisected it to the following commit which rapidly starts to run > > sluggishly on my setup: > > https://github.com/qemu/qemu/commit/73fd282e7b6dd4e4ea1c3bbb3d302c8db51e4ccf > > Thanks for bisecting this bug! Arch Linux can work around it in the > short term by building with ./configure --disable-linux-io-uring > and/or removing the liburing build dependency.
Hmm...a brief look at the Arch Linux package source suggests QEMU is not being built with io_uring enabled. Anatol, please confirm whether this is correct. If io_uring is not enabled then this bug may affect most existing users on Linux. Initially I thought it was because Arch Linux had enabled the new io_uring feature but I was probably mistaken.