Date: Mon, 7 Jul 2014 21:32:52 +0200 From: John Hay <jhay@meraka.org.za> To: hiren panchasara <hiren.panchasara@gmail.com> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org>, "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org>, Ian Lepore <ian@freebsd.org> Subject: Re: CAMBRIA and more than one atheros card Message-ID: <20140707193252.GA79553@zibbi.meraka.csir.co.za> In-Reply-To: <CALCpEUG1hCqHW8dKxSzPeaAJW5aevY_wHwWzoF%2Bfv9ypju-8wg@mail.gmail.com> References: <20140707142538.GA43661@zibbi.meraka.csir.co.za> <CAJ-VmompzxOYXQ0_bmGsRHH7dGahEEGRsv-OqPMgAdB2NVOaaw@mail.gmail.com> <1404753166.65432.10.camel@revolution.hippie.lan> <CAJ-Vmo=zY%2B6J24s3Ux5LR7UVaQ3N5=eXHfAG-cOxXWbhJoHCGA@mail.gmail.com> <20140707182814.GA75629@zibbi.meraka.csir.co.za> <CAJ-VmokGC6-DHQP1V9exEq-VPW-oN972uYSbZQDuq4KiPb1SeA@mail.gmail.com> <CALCpEUG1hCqHW8dKxSzPeaAJW5aevY_wHwWzoF%2Bfv9ypju-8wg@mail.gmail.com>
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On Mon, Jul 07, 2014 at 11:59:03AM -0700, hiren panchasara wrote: > On Mon, Jul 7, 2014 at 11:31 AM, Adrian Chadd <adrian@freebsd.org> wrote: > > On 7 July 2014 11:28, John Hay <jhay@meraka.org.za> wrote: > >> On Mon, Jul 07, 2014 at 11:22:46AM -0700, Adrian Chadd wrote: > >>> On 7 July 2014 10:12, Ian Lepore <ian@freebsd.org> wrote: > >>> > On Mon, 2014-07-07 at 09:25 -0700, Adrian Chadd wrote: > >>> >> hi, > >>> >> > >>> >> That call is returning ENOMEM. I'm not sure why. It allocated an mbuf > >>> >> fine, but it couldn't allocate the DMA map. > >>> >> > >>> >> What's the output of "vmstat -z" ? I wonder if it's failing an allocation. > >>> >> > >>> >> > >>> >> > >>> >> -a > >>> > > >>> > Lack of bounce buffers is a posibility that won't show up in vmstat > >>> > output. > >>> > >>> right, but there's a bunch of already failing vmstat entries. > >>> > >>> > >>> John - there's a vmscale parameter somewhere. Hiren had to drop it > >>> down for his APs to work in 64MB of RAM. I think it's > >>> vm.kmem_size_scale . What's it say for you? > >>> > >> > >> :~ # sysctl vm.kmem_size_scale > >> vm.kmem_size_scale: 3 > > > > Ok. Search the archives for an email from Hiren titled "mbuf autotuning effect". > > > > TL;DR - set it to 1 and recompile. There's a kernel option somewhere > > to do exactly that. > > Yes. http://lists.freebsd.org/pipermail/freebsd-mips/2013-September/003081.html > > I went through this for my tplink. > > John, can you show o/p of: > > sysctl -a | grep hw | grep mem > and > sysctl -a | grep maxmbuf I already compiled a new kernel with "options VM_KMEM_SIZE_SCALE=1" and the problems went away. :-) On the new kernel the output is: ########################## :~ # sysctl -a | grep hw | grep mem hw.physmem: 128196608 hw.usermem: 103845888 hw.realmem: 134213632 :~ # sysctl -a | grep maxmbuf kern.ipc.maxmbufmem: 62705664 ########################## I rebooted with the old kernel and its output is: ########################## :~ # sysctl -a | grep hw | grep mem hw.physmem: 128196608 hw.usermem: 104124416 hw.realmem: 134213632 :~ # sysctl -a | grep maxmbuf kern.ipc.maxmbufmem: 20901888 ########################## So for the heck of it, I ran my script again and this time it successfully configured the 3 atheros interfaces. ? How can that be? One other thing I also do not understand. I have an Avila (with 64M RAM, half of the CAMBRIA), also with 3 atheros cards and there it always works. But if "options VM_KMEM_SIZE_SCALE=1" keeps the problem away, then I'll leave that in my kernel. :-) Thanks for everyone that helped. John -- John Hay -- jhay@meraka.csir.co.za / jhay@meraka.org.za
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