BKVASIZE
seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
int factor = 4 * BKVASIZE / 1024;
if (maxbcache && nbuf > maxbcache / BKVASIZE)
nbuf = maxbcache / BKVASIZE;
maxbuf = (LONG_MAX / 3) / BKVASIZE;
maxbuf_sz = maxbcache != 0 ? maxbcache : maxbuf * BKVASIZE;
buf_sz = (long)nbuf * BKVASIZE;
nbuf = buf_sz / BKVASIZE;
maxbufspace = (long)nbuf * BKVASIZE;
while ((long)hidirtybuffers * BKVASIZE > 3 * hibufspace / 4) {
#ifndef BKVASIZE
#define BKVAMASK (BKVASIZE-1)
size = (long)nbuf * BKVASIZE + (long)bio_transient_maxcnt * maxphys;
size = (long)nbuf * BKVASIZE;
PAGE_SIZE, (mp_ncpus > 4) ? BKVASIZE * 8 : 0, M_WAITOK);