On Wed 30 Aug 2017 02:10:53 PM CEST, Pradeep Jagadeesh wrote: >> I'm trying to read from an 9p share that has limits set with hmp >> fsdev_set_io_throttle and I'm having some problems.
Here's one simple way to reproduce it: 1) Launch qemu with -fsdev local,security_model=none,id=fs0,path=/some/files -device virtio-9p-pci,fsdev=fs0,mount_tag=fs0 2) In the guest, mount the fs0 share in /mnt 3) Run this hmp command fsdev_set_io_throttle fs0 0 4096 0 0 0 0 4) In the guest, start reading some large file from the 9p share: dd if=/mnt/large_file of=/dev/null bs=4k iflag=direct status=progress 5) Check the progress, reading speed should be around 4k per second. 6) While dd is still running, change the I/O limits: fsdev_set_io_throttle fs0 0 8192 0 0 0 0 7) If you check the status of the dd command, reading should be faster now. Instead, it is stalled. Berto
