Tuna: Problem move thread cxgb4 to cpu

Issue

When I execute : # tuna --cpus=1,3 --threads=cxgb4 --move
there are return :

Traceback (most recent call last):
  File "/usr/bin/tuna", line 598, in <module>
    main()
  File "/usr/bin/tuna", line 514, in main
    spread = spread)
  File "/usr/lib/python2.6/site-packages/tuna/tuna.py", line 231, in move_threads_to_cpu
    raise e
OSError: [Errno 22] Invalid argument