illumos gate

Actually, static globals are perfectly visible to mdb.

Actually, it's not a problem of visibility.

Code in nfs4_common.c:
static uint_t nfs4_max_transfer_size = 32 * 1024;
static uint_t nfs4_max_transfer_size_cots = 1024 * 1024;
static uint_t nfs4_max_transfer_size_rdma = 1024 * 1024;
int
nfs4tsize(void) {
/* * For the moment, just return nfs4_max_transfer_size until we * can query the appropriate transport.
*/
return (nfs4_max_transfer_size);
}

::dis nfs4tsize
nfs4tsize: pushq %rbp
nfs4tsize+1: movq %rsp, %rbp
nfs4tsize+4: movl $0x8000, %eax
nfs4tsize+9: leave
nfs4tsize+0xa: ret

As you can see, nfs4_max_transfer_size value hard coded and can't be changed at all.