Date: Tue, 17 Sep 2013 23:06:08 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Hans Petter Selasky <hans.petter.selasky@bitfrost.no> Cc: Harald Schmalzbauer <h.schmalzbauer@omnilan.de>, FreeBSD Stable <freebsd-stable@FreeBSD.org>, freebsd-usb@FreeBSD.org Subject: Re: umcs (4-Port-USB-serial) triggering way too much ehci IRQs Message-ID: <698621013.20130917230608@serebryakov.spb.ru> In-Reply-To: <52387DAA.1020109@bitfrost.no> References: <52372DBA.6020703@omnilan.de> <zarafa.5237e529.2bc6.08fde6eb34c27a87@mail.lockless.no> <875323075.20130917124437@serebryakov.spb.ru> <523816E1.10603@omnilan.de> <1857258551.20130917124737@serebryakov.spb.ru> <5238198C.3070604@bitfrost.no> <52381BAC.5010801@omnilan.de> <52381FCA.5030509@bitfrost.no> <5238775C.8010000@omnilan.de> <52387DAA.1020109@bitfrost.no>
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Hello, Hans. You wrote 17 =D1=81=D0=B5=D0=BD=D1=82=D1=8F=D0=B1=D1=80=D1=8F 2013 =D0=B3.,= 20:04:58: HPS> I think the adapters use very small buffers. You can try adding HPS> ".interval =3D 4" to the other USB configs, above the one you patched,= and=20 HPS> see what happens. I cannot tell if you will loose characters or not. Datasheet promise 2x512 bytes FIFO for each port (on USB level, and typical 16 bytes buffers on UART level, because it emulates 16c550 compatible UARTs)... Maybe, my setup of these FIFO buffers are not optimal, but datasheet (even "NDA"-marked onem and I don't mention public, which is total bullshit) doesn't say anything about configuring these buffers. --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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