Date: Tue, 15 Nov 2011 13:21:31 -0800 From: mdf@FreeBSD.org To: Hans Petter Selasky <hselasky@c2i.net> 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: <CAMBSHm9%2Bhsa0fvVvdLkFZkMoAQ6vkspWpvsfV1%2BJPtJe72J9cQ@mail.gmail.com> In-Reply-To: <CAMBSHm8HXCfF3yVp9fFwAAThL6Aaki=iuV7-Qtz3g7tpsm-VLw@mail.gmail.com> References: <201111152048.pAFKmvNC016452@svn.freebsd.org> <CAMBSHm_Hs1rhNTb2Fp_MU0Wzkrom721oJjzDaqe8sArp6FFivg@mail.gmail.com> <201111152202.24093.hselasky@c2i.net> <CAMBSHm8HXCfF3yVp9fFwAAThL6Aaki=iuV7-Qtz3g7tpsm-VLw@mail.gmail.com>
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On Tue, Nov 15, 2011 at 1:20 PM, <mdf@freebsd.org> wrote: > On Tue, Nov 15, 2011 at 1:02 PM, Hans Petter Selasky <hselasky@c2i.net> wrote: >> For USB compliant operation, the USB stack requires hz to be greater or equal >> to 250 hz, to put it like that. Mostly a requirement in USB gadget/device >> mode. > > Really? That's news to me. Is that documented somewhere? I know we > still use hz=100 internally, but we're on stable/7 still so not using > the new USB stack yet. ... and I also just remembered that I have seen recommendations that, when FreeBSD is used as a virtual machine, hz should be set to 100 so that the virtual interrupt overhead is reduced. Those two recommendations are at odds with each other. Thanks, matthew
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