Date: Sun, 25 Oct 1998 16:23:17 -0800 From: Ulf Zimmermann <ulf@Alameda.net> To: "Kenneth D. Merry" <ken@plutotech.com> Cc: current@FreeBSD.ORG Subject: Re: Again, questions, questions Message-ID: <19981025162317.F21744@Alameda.net> In-Reply-To: <199810260009.RAA08950@panzer.plutotech.com>; from Kenneth D. Merry on Sun, Oct 25, 1998 at 05:09:47PM -0700 References: <19981025155359.E21744@Alameda.net> <199810260009.RAA08950@panzer.plutotech.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, Oct 25, 1998 at 05:09:47PM -0700, Kenneth D. Merry wrote: > Ulf Zimmermann wrote... > > Ok, it seems I am now able to read and write to the Mylex system drive. > > it is still slow because the kernel is giving me a single block request. > > So how can I tell the kernel I can do more then 1 at a time ? > > Are you going through a block or character device? Character. > > > And how can I tell the kernel the size of a drive ? > > I assume this is sort of a disk driver (like da(4)) and a controller > driver (ahc(4), ahb(4)) rolled into one? Yes. > > If so, your interface to the upper-level code will have to be like a disk > device. That means you'll have a size routine that is registered in your > cdevsw structure. I have a size routine, but it never gets called. > > You may want to take a look at src/sys/cam/scsi/scsi_da.c for an example > disk driver. It has a routine, dasize(), that returns the size of the > disk. > > Ken > -- > Kenneth Merry > ken@plutotech.com -- Regards, Ulf. --------------------------------------------------------------------- Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-769-2936 Alameda Networks, Inc. | http://www.Alameda.net | Fax#: 510-521-5073 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19981025162317.F21744>