On Thu, Feb 21, 2013 at 02:17:14PM +0100, Christian Borntraeger wrote: > On 20/02/13 11:28, Stefan Hajnoczi wrote: > > Amos Kong <ak...@redhat.com> reported that file descriptors numbered higher > > than 1024 could crash QEMU. This is due to the fixed size of the fd_set > > type > > used for select(2) event polling. > > > > Good to see somebody working on that. > We have just faced this problem on s390 after we have experimentally enabled > ioeventfd > for virtio-ccw. We have several scenarios were we want > 600 devices for the > guest > and the select loops then fails horribly because we exceed the 1024 fd > barrier. > > So this looks like it could become a bugfix for that problem. > > In terms of scalability it is probably better to have multiple threads that > poll on their > fds, instead of having one i/o thread.
I think we'll get there, I'm currently working on adding multiple event loop support to QEMU. Stefan
