MAXISPREQUEST
sdp->isp_max_queue_depth = MAXISPREQUEST(isp);
#define RQUEST_QUEUE_LEN(x) MAXISPREQUEST(x)
#define RESULT_QUEUE_LEN(x) MAXISPREQUEST(x)
(((MAXISPREQUEST(x) >> 2) < 64)? 64 : MAXISPREQUEST(x) >> 2)