Documentating patch for defaults/loader.conf

[Dmitry Morozovsky]

On Tue, 23 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

I could not agree more! ;)

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