MSIZE
if (sizeof(struct mbuf) != MSIZE)
sizeof(struct mbuf), MSIZE);
CTASSERT(MSIZE == sizeof(struct mbuf));
m_pool_init(&mbpool, MSIZE, 64, "mbufpl");
mbcnt += MSIZE;
if (sbspace_locked(&so->so_rcv) < (2 * MSIZE) ||
#define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
sb->sb_mbcnt += MSIZE;
sb->sb_mbcnt -= MSIZE;