From owner-freebsd-hackers Sat May 20 14: 6: 1 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (Postfix) with ESMTP id 0375037B5FE for ; Sat, 20 May 2000 14:05:57 -0700 (PDT) (envelope-from imp@billy-club.village.org) Received: from billy-club.village.org (billy-club.village.org [10.0.0.3]) by rover.village.org (8.9.3/8.9.3) with ESMTP id PAA00276; Sat, 20 May 2000 15:05:55 -0600 (MDT) (envelope-from imp@billy-club.village.org) Received: from billy-club.village.org (localhost.village.org [127.0.0.1]) by billy-club.village.org (8.9.3/8.8.3) with ESMTP id PAA54031; Sat, 20 May 2000 15:05:19 -0600 (MDT) Message-Id: <200005202105.PAA54031@billy-club.village.org> To: Sergey Babkin Subject: Re: further question to bus_alloc_resource Cc: Alexander Langer , hackers@FreeBSD.ORG In-reply-to: Your message of "Sat, 20 May 2000 16:08:47 EDT." <3926F0CF.DA23E3AD@bellatlantic.net> References: <3926F0CF.DA23E3AD@bellatlantic.net> <20000520013751.A5852@cichlids.cichlids.com> <20000520014352.B5947@cichlids.cichlids.com> <3925E63E.EF415CFF@bellatlantic.net> <20000520114607.A1832@cichlids.cichlids.com> Date: Sat, 20 May 2000 15:05:19 -0600 From: Warner Losh Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <3926F0CF.DA23E3AD@bellatlantic.net> Sergey Babkin writes: : Well, I suppose unloading drivers makes much sense only in case : if hardware supports hot-plug. And when one is developing the driver, it helps a whole lot to add unload capability. kldunload takes 1 second. reboot takes 120. : I see the argument of upgrading the : driver version without reboot as purely theoretical. For driver : debugging the need to chnage the driver commonly happens after : the old version somehow wedges the system. And upgrading drivers : on a running production system is not something I personally would : do. This is a dangerous operation and if it would cause any problems : they would better happen at pre-scheduled boot time, not on a running : machines with users. That's why loading drivers at higher security levels is prohibited. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message