Date: Wed, 7 Aug 2013 20:37:36 -0700 From: Tim Kientzle <tim@kientzle.com> To: Andre Oppermann <andre@FreeBSD.org> Cc: Adrian Chadd <adrian@FreeBSD.org>, current@FreeBSD.org, Bryan Venteicher <bryanv@daemoninthecloset.org>, Navdeep Parhar <np@FreeBSD.org>, net@FreeBSD.org, Giuseppe Lettieri <g.lettieri@iet.unipi.it>, Luigi Rizzo <rizzo@iet.unipi.it> Subject: Re: [net] protecting interfaces from races between control and data ? Message-ID: <170757A0-2A8A-4F48-B5A0-20EC725B963B@kientzle.com> In-Reply-To: <520127C3.3020101@freebsd.org> References: <20130805082307.GA35162@onelab2.iet.unipi.it> <2034715395.855.1375714772487.JavaMail.root@daemoninthecloset.org> <CAJ-VmokT6YKPR7CXsoCavEmWv3W8urZu4eBVgKWaj9iMaVJFZg@mail.gmail.com> <CA%2BhQ2%2BhuoCCweq7fjoYmH3nyhmhb5DzukEdPSMtaJEWa8Ft0JQ@mail.gmail.com> <51FFDD1E.1000206@FreeBSD.org> <CAJ-Vmo=Q9AqdBJ0%2B4AiX4%2BWreYuZx6VGGYw=MZ4XhMB1P2yMww@mail.gmail.com> <CA%2BhQ2%2BgZTGmrBKTOAeFnNma4DQXbAy_y8NZrovpWqm_5BJTWhQ@mail.gmail.com> <5200136C.8000201@freebsd.org> <20130805215319.GA43271@onelab2.iet.unipi.it> <520127C3.3020101@freebsd.org>
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On Aug 6, 2013, at 9:43 AM, Andre Oppermann wrote: > The driver supplies a TX frame transmit function (mostly like if_transmit > today) which does all locking and multi-queue handling internally (driver > owned. This gives driver writers the freedom to better adjust to different > hardware communication methods as they become available, like we witnessed > a couple of times in the past. How would you handle TX dequeue? I'm curious because I got a nice speedup with cpsw by not using the TX interrupt at all: I just dequeued completed packets at the end of the TX transmit function. I suppose this would still work with your scheme. Tim
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