-------- Mateusz Guzik writes: > It is high because of this: > msleep(&vnlruproc_sig, &vnode_list_mtx, PVFS, "vlruwk", hz); > > i.e. it literally sleeps for 1 second.
Before the line looked like that, it slept on "lbolt" aka "lightning bolt" which was woken once a second. The calculations which come up with those "constants" have always been utterly bogus math, not quite "square-root of shoe-size times sun-angle in Patagonia", but close. The original heuristic came from university environments with tons of students doing assignments and nethack behind VT102 terminals, on filesystems where files only seldom grew past 100KB, so it made sense to scale number of vnodes to how much RAM was in the system, because that also scaled the size of the buffer-cache. With a merged VM buffer-cache, whatever validity that heuristic had was lost, and we tweaked the bogomath in various ways until it seemed to mostly work, trusting the users for which it did not, to tweak things themselves. Please dont tweak the Finagle Constants again. Rip all that crap out and come up with something fundamentally better. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"