Date: Tue, 06 May 2014 11:19:57 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Adrian Chadd <adrian@freebsd.org>, Ian Lepore <ian@freebsd.org> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: USB isochronous traffic with Rasberry Pi [WAS: Re: USB audio device on Raspberry Pi] Message-ID: <5368A93D.3070608@selasky.org> In-Reply-To: <CAJ-Vmok-%2B7%2Bcq%2BDa6_C2AA7BuP5readY_Gfwwm_RF5kh4VerQA@mail.gmail.com> References: <20140425154430.GA76168@utility-01.thismonkey.com> <535A8AEA.1000100@selasky.org> <20140425204134.GA458@cicely7.cicely.de> <20140430091411.GA45015@utility-01.thismonkey.com> <5360C0A7.9010407@selasky.org> <1398867266.22079.51.camel@revolution.hippie.lan> <CAGW5k5bZ_bTQUXuzNm=tbwx3npz1_HoOR3vM8TBRVFs8zWCq-w@mail.gmail.com> <5362638B.1080104@selasky.org> <5363C133.2000304@selasky.org> <53677CB8.5000800@selasky.org> <CAJ-Vmo=XmH-RX6_i13NuAXhq-jTC%2BWedGiyOMJaPO4r014DSgw@mail.gmail.com> <1399303695.22079.239.camel@revolution.hippie.lan> <1399304157.22079.243.camel@revolution.hippie.lan> <CAJ-Vmok-%2B7%2Bcq%2BDa6_C2AA7BuP5readY_Gfwwm_RF5kh4VerQA@mail.gmail.com>
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On 05/05/14 17:51, Adrian Chadd wrote: > On 5 May 2014 08:35, Ian Lepore <ian@freebsd.org> wrote: > >> Oh never mind, I just noticed you said KTR, not printf. > > Heh. > > That's why I like KTR. > > I bet some devices dislike you doing the "read registers all the time" > dance. Espeically if they're on an ISA bus where it's really expensive > to do things. But yes, your point is pretty spot on. > Hi, I've made another patch to reduce the number of interrupts generated by the DWC OTG in host mode: http://svnweb.freebsd.org/changeset/base/265427 Still it is loosing service intervals at fixed rate 8K/second. I added to DELAY(): if (!cold) return; It made no difference. I also tried to set INTR_PRIO_TTY instead of XXX_BIO. No difference either. I'll do some more checking later today. --HPS
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