Date: Mon, 7 Jul 2014 12:43:17 -0700 From: Adrian Chadd <adrian@freebsd.org> To: John Hay <jhay@meraka.org.za> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org>, Ian Lepore <ian@freebsd.org>, "freebsd-embedded@freebsd.org" <freebsd-embedded@freebsd.org> Subject: Re: CAMBRIA and more than one atheros card Message-ID: <CAJ-VmonOuB89FjreKEjBPf_m03dv886k%2BDs_Eo=pigquLnJ%2B_w@mail.gmail.com> In-Reply-To: <20140707193252.GA79553@zibbi.meraka.csir.co.za> 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> <20140707193252.GA79553@zibbi.meraka.csir.co.za>
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Sweet! Can you run the same commands above on the Avila board? Would you mind filing a PR to ensure we get that option into the relevant kernel(s) ? (I'm kinda tempted to suggest we auto-select the scaling factor at startup depending upon physical RAM .. ) -a On 7 July 2014 12:32, John Hay <jhay@meraka.org.za> wrote: > 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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