Date: Tue, 11 Dec 2001 16:14:55 -0800 From: Luigi Rizzo <rizzo@aciri.org> To: net@freebsd.org Subject: Polling code at http://info.iet.unipi.it/~luigi/polling/ Message-ID: <20011211161454.B23443@iguana.aciri.org>
next in thread | raw e-mail | index | archive | help
[Bcc to committers and -stable as relevant there, but please keep the discussion on -net if any] I have put up a web page with the latest version of the device polling patches, both for -stable and -current, at http://info.iet.unipi.it/~luigi/polling/ so new versions will be available through there, together with additional documentation, code and references. Compared to the code recently pulled out from -stable, what you can find now at the above URL has the following improvements: * "scheduling" code which lets you control in a reasonably fine-grained way the sharing of CPU between kernel (polling) and userland. You can now do something like sysctl kern.polling.user_frac=40 to reserve 40% of the CPU time to userland processes (assuming there is enough work to do). Default value is 50. * a restructured polling loop which prevents livelock and unfairness even when the standard (no fastforwarding) path is used. Together with the kern.polling.enable variable, kern.polling.user_frac is the only tunable parameter that you need to care about, and the default value should be a reasonable one. It would be great if some of you committers would have the time to have a look at the -current version, or possibly even try it on Alpha boxes (I think overall there is only one or two lines of MD code), and send feedback. thanks luigi ----------------------------------+----------------------------------------- Luigi RIZZO, luigi@iet.unipi.it . ACIRI/ICSI (on leave from Univ. di Pisa) http://www.iet.unipi.it/~luigi/ . 1947 Center St, Berkeley CA 94704 Phone: (510) 666 2927 ----------------------------------+----------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20011211161454.B23443>