Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 beta 3/9/83; site mot.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!godot!harvard!seismo!ut-sally!oakhill!mot!fred From: fred@mot.UUCP (Fred Christiansen) Newsgroups: net.periphs Subject: caching disk controllers for Unix Message-ID: <69@mot.UUCP> Date: Fri, 4-Jan-85 12:57:54 EST Article-I.D.: mot.69 Posted: Fri Jan 4 12:57:54 1985 Date-Received: Sun, 6-Jan-85 00:45:31 EST Organization: Motorola Microsystems, Phoenix AZ Lines: 10 [] anyone have experience with these? do they really help? the sector cachers say you gotta do it this way because of Unix' habit of fragmenting a file all over the place. but, since Unix caches blocks anyway, does sector caching help? my guess is it would if the controllers memory exceeded kernel's buffer cache. the track cachers say their scheme helps for now and will be best once scatter/gather HW memory management is available. the latter seems contrary to the free list, which is fairly integral to the current Unix kernel's view of the file system (no reason why there couldn't be another, I suppose).