Date: Sun, 25 Oct 1998 17:09:47 -0700 (MST) From: "Kenneth D. Merry" <ken@plutotech.com> To: ulf@Alameda.net Cc: current@FreeBSD.ORG Subject: Re: Again, questions, questions Message-ID: <199810260009.RAA08950@panzer.plutotech.com> In-Reply-To: <19981025155359.E21744@Alameda.net> from Ulf Zimmermann at "Oct 25, 98 03:53:59 pm"
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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? > 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? 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. 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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