On Thu, 12/01 12:07, Bob Chen wrote: > Test case: > > 1. QEMU 1.1.2 > 2. Run fio inside the vm, give it some pressure. Watch the realtime > throughput > 3. block_set_io_throttle drive_2 100000000 0 0 2000 0 0 # throttle > bps and iops, any value > 4. Observed that the IO is very likely to freeze to zero. The fio process > stuck! > 5. Kill the former fio process, start a new one. The IO turns back to normal > > Didn't reproduce it with QEMU 2.5. > > > Actually I'm not wishfully thinking the community would help fix this bug > on such an ancient version. Just hope someone can tell me what is the root > cause. Then I have to evaluate whether I should move to higher version > QEMU, or fix this bug on 1.1.2 in-place(if it is a small one).
The throttling implementation is completely refreshed so I think it's not easy to suggest a root cause for you. Fam
