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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