MAXCPUFIFO
KKASSERT(ip->ip_windex - ip->ip_rindex < MAXCPUFIFO);
level1 = MAXCPUFIFO / 2;
level2 = MAXCPUFIFO / 4;
level1 = MAXCPUFIFO - 3;
level2 = MAXCPUFIFO - 5;
KKASSERT(ip->ip_windex - ip->ip_rindex != MAXCPUFIFO - 1);
if (ip->ip_windex - ip->ip_rindex >= MAXCPUFIFO / 4) {
#define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
} ip_info[MAXCPUFIFO];