Date: Mon, 24 Dec 2012 04:50:22 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Sergey Kandaurov <pluknet@gmail.com> Cc: Marten Vijn <info@martenvijn.nl>, freebsd-stable@freebsd.org, jakub_lach@mailplus.pl Subject: Re: 9.1 minimal ram requirements Message-ID: <20121224041301.W83325@sola.nimnet.asn.au> In-Reply-To: <CAE-mSOLe7W0sxFqmRw7NEjhdMpUL7AmstTkGBVMrpjiPfE%2B2vg@mail.gmail.com> References: <1356218834151-5771583.post@n5.nabble.com> <50D644E5.9070801@martenvijn.nl> <CAE-mSOLQrWfEb8Wr4Hd1yU10DsJW_koB-PCA=RO5h1xvP_CT6Q@mail.gmail.com> <20121223150954.B81991@sola.nimnet.asn.au> <CAE-mSOLe7W0sxFqmRw7NEjhdMpUL7AmstTkGBVMrpjiPfE%2B2vg@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, 23 Dec 2012 15:21:23 +0300, Sergey Kandaurov wrote:
> On 23 December 2012 10:22, Ian Smith <smithi@nimnet.asn.au> wrote:
> > On Sun, 23 Dec 2012 03:45:39 +0300, Sergey Kandaurov wrote:
> > > This (i.e. the "kmem_map too small" message seen with kernel memory
> > > shortage) could be due to CAM CTL ('device ctl' added in 9.1), which is
> > > quite a big kernel memory consumer.
> > > Try to disable CTL in loader with kern.cam.ctl.disable=1 to finish boot.
> >
> > I've just added that, thanks Sergey, but it's sadly not an option for
> > installation. I guess it's too late for the release notes - which at
> > RC3 made no mention of CAM CTL at all - but it's not yet clear to me
> > whether even 256MB is enough to boot, install and run 9.1 GENERIC?
>
> If you perform clean installation (e.g. from ISO), you can escape to the
> loader prompt and set the tunable there w/o the need for /boot/loader.conf.
> I experimented with Vbox and AFAIK 256MB was enough even with CAM CTL.
Ah right; I'd booted and installed from memstick, where escape to loader
prompt is not an option. I'll burn a disc1 and try that with the 128MB
again, and make sure that 256MB is comfortable - after holiday madness.
> > > A longer term workaround could be to postpone those memory allocations
> > > until the first call to CTL.
That would seem to make sense, while making it a module is still on the
todo list. I guess there must be systems that need CAM CTL to boot?
> > Under what circumstances is CAM CTL needed? What would leaving it out
> > of GENERIC cost, and whom? Is it loadable? dmesg.boot reports loading,
> > but I don't see a module, nor can I find much information about CTL in
> > cam(3|4) or /sys/conf/NOTES. apropos found ctladm and ctlstat, but I'm
> > little the wiser as to when it may be needed, beyond CAM/SCSI debugging?
>
> The purpose and current status are well documented in the initial commit
> message (r229997) and the supplied README.ctl.txt. To my modest knowledge,
> it should be safe to just comment out 'device ctl' in GENERIC.
Thanks for the reference, seems that I won't be needing it just now; it
just wasn't clear to me what if any other subsystems might hang off it.
cheers, Ian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20121224041301.W83325>