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. Still this looks like a good thing to do. Christian
