Date: Mon, 22 Aug 2011 23:30:55 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Dmitry Morozovsky <marck@FreeBSD.org> Cc: freebsd-scsi@FreeBSD.org, re@FreeBSD.org Subject: Re: Documentating patch for defaults/loader.conf Message-ID: <4E52BC7F.4040408@FreeBSD.org> In-Reply-To: <alpine.BSF.2.00.1108230006530.26004@woozle.rinet.ru> References: <alpine.BSF.2.00.1108222151140.8634@woozle.rinet.ru> <20110822194031.GR17489@deviant.kiev.zoral.com.ua> <alpine.BSF.2.00.1108230006530.26004@woozle.rinet.ru>
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On 22.08.2011 23:10, Dmitry Morozovsky wrote:
> On Mon, 22 Aug 2011, Kostik Belousov wrote:
>>> any objections for this simple patch?
>>>
>>> (we stumped into this yesterday, and no easy founded answers even on Google
>>> except the single FreeBSD Forums thread was found)
>>
>> I do not think that the wording in right, but I am not CAM expert by any
>> measure. From my reading of the code, it is a hook to delay the root mount,
>> not to delay CAM bus registration. It would be better if you get the scsi@
>> or mav@ (author of the tunable) review.
>
> I based the comment on existing comment to the tunable in cam_xpt.c:
>
> cam_xpt.c:TUNABLE_INT("kern.cam.boot_delay",&xsoftc.boot_delay);
> cam_xpt.c:SYSCTL_INT(_kern_cam, OID_AUTO, boot_delay, CTLFLAG_RDTUN,
> cam_xpt.c:&xsoftc.boot_delay, 0, "Bus registration wait time");
>
>
> Alexander, colleagues, your thought on the following patch?
>
> -- 8< --
> Index: boot/forth/loader.conf
> ===================================================================
> --- boot/forth/loader.conf (revision 224542)
> +++ boot/forth/loader.conf (working copy)
> @@ -109,6 +109,8 @@
> #kern.ncallout="" # Set the maximum # of timer events
> #kern.ngroups="1023" # Set the maximum # of supplemental groups
> #kern.sgrowsiz="" # Set the amount to grow stack
> +#kern.cam.boot_delay="10000" # CAM bus registration delay (in ms),
> + # useful for USB sticks as root
> #kern.cam.scsi_delay="2000" # Delay (in ms) before probing SCSI
> #kern.ipc.maxsockets="" # Set the maximum number of sockets
> avaliable
> #kern.ipc.nmbclusters="" # Set the number of mbuf clusters
> -- 8< --
Yes, I agree that wording is not perfect. It is not a delay of the bus
registration, but instead boot delay for the bus registration. Original
sysctl description is closer to the right meaning.
--
Alexander Motin
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