Documentating patch for defaults/loader.conf

[Kostik Belousov]

On Tue, Aug 23, 2011 at 12:57:05AM +0400, Dmitry Morozovsky wrote:
> On Tue, 23 Aug 2011, 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?
> 
> [reply by mav@ viewed on web archives, but lost somewhere]
> 
> Well, what about the following wording then?
> 
> marck at woozle:~/FreeBSD/svn/head/sys> svn diff
> 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"   # Delay (in ms) for CAM bus registration,
> +                               # useful for USB sticks as root
Delay (in ms) of root mount for CAM bus registration, ...

>  #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
> 
> 
> -- 
> Sincerely,
> D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
> [ FreeBSD committer:                                 marck at FreeBSD.org ]
> ------------------------------------------------------------------------
> *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
> ------------------------------------------------------------------------
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