Date: Mon, 7 Jul 2014 11:31:04 -0700 From: Adrian Chadd <adrian@freebsd.org> To: John Hay <jhay@meraka.org.za> 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: <CAJ-VmokGC6-DHQP1V9exEq-VPW-oN972uYSbZQDuq4KiPb1SeA@mail.gmail.com> In-Reply-To: <20140707182814.GA75629@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>
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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. -a
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