Hi ! > Is there a limit on kern.ipc.shmmax on amd64? Yep, this is because int type (32 bit) usage instead size_t in sysv code. > Should I file a PR? If so, is there a workaround? I've made fix for 7.0-CURRENT: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/113218 Vasim V.