Date: Fri, 27 Aug 1999 16:09:50 +0930 From: Greg Lehey <grog@lemis.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Poul-Henning Kamp <phk@critter.freebsd.dk>, Christopher Masto <chris@netmonger.net>, "John W. DeBoskey" <jwd@unx.sas.com>, julian@whistle.com, freebsd-current@FreeBSD.ORG Subject: Re: -current kernel problems (spec_getpages & vm_fault) Message-ID: <19990827160950.X483@freebie.lemis.com> In-Reply-To: <199908262325.QAA25436@apollo.backplane.com>; from Matthew Dillon on Thu, Aug 26, 1999 at 04:25:14PM -0700 References: <1673.935703901@critter.freebsd.dk> <199908262325.QAA25436@apollo.backplane.com>
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On Thursday, 26 August 1999 at 16:25:14 -0700, Matthew Dillon wrote: >>>> int devminor; /* minor number */ >>>> >>>> devminor = minor(dev); >>>> + dev->si_bsize_phys = DEV_BSIZE; >>>> + dev->si_bsize_best = BLKDEV_IOSIZE; >>>> + dev->si_bsize_max = MAXBSIZE; >>> >>> Bingo! Thank you. >> >> Cool, I expect grog will commit it soon. So did I until I read this message. > The patch for ccd is not quite right. Here is the patch from my > big fat patch at http://www.backplane.com/FreeBSD4/ > > The problem is that you cannot simply set the physical sector > size to DEV_BSIZE if the underlying device has a larger sector > size. If you do, specfs's blocksize alignment (another fix in > my big fat patch) will be incorrect and result in an I/O error > on the physical media. > > For example, swap-backed VN devices have a sector size of one page, > i.e. 4K. Vinum currently doesn't track the sector size of the drives. I'll have to put some code in there to DTRT. In the meantime, I'll set si_bsize_best to 4K in the hope that this will be OK. Are there any larger block sizes in current use? Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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