Date: Mon, 01 Jul 2019 17:14:48 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Warner Losh <imp@bsdimp.com> Cc: Ian Lepore <ian@freebsd.org>, Andriy Gapon <avg@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: i2c bit banging timeout for SCL Message-ID: <93148.1562001288@critter.freebsd.dk> In-Reply-To: <CANCZdfoFBvmxPtnEL4GOqXTvp6Zd-xrtja4rmUO1rAcy0JdeSw@mail.gmail.com> References: <a3538c10-2438-a287-77db-ad390078b274@FreeBSD.org> <7e5d8a06bc2d46263262369464e9348b82263847.camel@freebsd.org> <CANCZdfoFBvmxPtnEL4GOqXTvp6Zd-xrtja4rmUO1rAcy0JdeSw@mail.gmail.com>
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-------- In message <CANCZdfoFBvmxPtnEL4GOqXTvp6Zd-xrtja4rmUO1rAcy0JdeSw@mail.gmail= .com>, Warner Losh writes: >The only issue, really, is that this timeout is a busy loop and there may >be I/O bus contention introduced on these systems. Does it have to be a busy loop for the entire duration ? Spin for the median, timeout+poll for the rest of the time ? -- = Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe = Never attribute to malice what can adequately be explained by incompetence= .
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