BICTCP_HZ
t <<= BICTCP_HZ;
delta = (cube_rtt_scale * offs * offs * offs) >> (10+3*BICTCP_HZ);
cube_factor = 1ull << (10+3*BICTCP_HZ); /* 2^40 */
t <<= BICTCP_HZ;
delta = (cube_rtt_scale * offs * offs * offs) >> (10+3*BICTCP_HZ);
static const __u64 cube_factor = (__u64)(1ull << (10+3*BICTCP_HZ))