From owner-freebsd-hackers Fri Dec 31 20:50:17 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by hub.freebsd.org (Postfix) with ESMTP id 4F6D014A2C; Fri, 31 Dec 1999 20:48:39 -0800 (PST) (envelope-from grog@freebie.lemis.com) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id PAA15989; Sat, 1 Jan 2000 15:18:26 +1030 (CST) Date: Sat, 1 Jan 2000 15:18:26 +1030 From: Greg Lehey To: Mike Smith Cc: Tom , freebsd-hackers@FreeBSD.ORG Subject: Re: softupdates and debug.max_softdeps Message-ID: <20000101151826.L1528@freebie.lemis.com> References: <199912310634.WAA00620@mass.cdrom.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0pre2i In-Reply-To: <199912310634.WAA00620@mass.cdrom.com> WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thursday, 30 December 1999 at 22:34:04 -0800, Mike Smith wrote: >> That is interesting. So I guess the conclusion to this is, softupdates >> is useful for bursty IO, but not sustained because it can get far behind >> until it eventually reaches the point where the machine reboots silently. >> I guess the delay until reboot is dependent on the size of max_softdeps. >> If it is big, it takes a while. > > I mentioned this a while back in the context of suspended I/O (in this > case, a RAID array busy dealing with a failed disk). There wasn't much > interest in dealing with it evinced at that point. On a related topic, I've taken to limiting the number of outstanding transactions in Vinum, mainly to try to hunt down some strange consistency problems when a very large number of transactions were outstanding (for those of you who have been following this, this was the "NULL b_biodone" syndrome). I still think there is a problem hidden in the system which causes this. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message