Date: Tue, 15 Nov 2011 22:08:15 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: mdf@freebsd.org Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "src-committers@freebsd.org" <src-committers@freebsd.org> Subject: Re: svn commit: r227541 - head/sys/dev/usb/controller Message-ID: <201111152208.15443.hselasky@c2i.net> In-Reply-To: <CAMBSHm_Hs1rhNTb2Fp_MU0Wzkrom721oJjzDaqe8sArp6FFivg@mail.gmail.com> References: <201111152048.pAFKmvNC016452@svn.freebsd.org> <CAMBSHm_Hs1rhNTb2Fp_MU0Wzkrom721oJjzDaqe8sArp6FFivg@mail.gmail.com>
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On Tuesday 15 November 2011 21:54:28 mdf@freebsd.org wrote: > Is there some reason these functions aren't asking for a delay in > terms of milli- or microseconds, and converting to hz internally? There is no strong reason for this except, that when everything is computed in system ticks, there is no need for further conversion when interfacing to the pause(), cv_timedwait() etc. Integer division can be quite expensive on embedded systems, and there are now several ports of my USB stack to other platforms :-) where most of them don't have anything near GHz CPU's. --HPS
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