The fix for the thread priority level on linux is available in the 0.3.1 release candidate here:
http://bitcointalk.org/index.php?topic=383.msg3198#msg3198
SN-1078 已核对来源，附原文与上下文。
linux 上线程优先级的修复在 0.3.1 候选版里： http://bitcointalk.org/index.php?topic=383.msg3198#msg3198