Am 20.03.2012 10:47, schrieb Paolo Bonzini: > Il 20/03/2012 10:40, Zhi Yong Wu ha scritto: >> HI, Kevin, >> >> We hope that I/O throttling can be shipped without known issue in QEMU >> 1.1, so if you are available, can you give this patch some love? > > I'm sorry to say this, but I think I/O throttling is impossible to save. > As it is implemented now, it just cannot work in the presence of > synchronous I/O, except at the cost of busy waiting with the global > mutex taken. See the message from Stefan yesterday.
qemu_aio_flush() is busy waiting with the global mutex taken anyway, so it doesn't change that much. Kevin
