Date: Thu, 8 Jun 2006 18:07:49 -0700 From: "Kip Macy" <kip.macy@gmail.com> To: rookie@gufi.org Cc: "M. Warner Losh" <imp@bsdimp.com>, perforce@freebsd.org, kmacy@freebsd.org, John Baldwin <jhb@freebsd.org>, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: PERFORCE change 98153 for review Message-ID: <b1fa29170606081807xac41117l1f9503a0e247599c@mail.gmail.com> In-Reply-To: <3bbf2fe10606020733j12bf706em51408b384135e966@mail.gmail.com> References: <200605301926.k4UJQkgt055284@repoman.freebsd.org> <200605311657.44921.jhb@freebsd.org> <b1fa29170606011726r78303d84y3d0116cff2174009@mail.gmail.com> <200606021022.44509.jhb@freebsd.org> <3bbf2fe10606020733j12bf706em51408b384135e966@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
I can't say how the two compare. But the lack of context stealing
undermines the value of our ithreads as far as I can tell.
-Kip
On 6/2/06, Attilio Rao <asmrookie@gmail.com> wrote:
> 2006/6/2, John Baldwin <jhb@freebsd.org>:
> > On Thursday 01 June 2006 20:26, Kip Macy wrote:
> > > > I'd rather avoid this for now as it will have to be backed out for
> > interrupt
> > > > filters.
> > >
> > > I don't know anything about interrupt filters, so please let me know
> > > what you have in mind. The whole of interrupt handling is far too
> > > heavyweight at the moment.
> >
> > With interrupt filters you can have both an INTR_FAST style handler and a
> > threaded handler, and the INTR_FAST style handler will have a return value to
> > determine if it's associated ithread should be scheduled and to let the
> > calling code know if it has handled the interrupt so that it doesn't need to
> > be masked, or if the interrupt wasn't for this device at all.
>
> I was wondering, it would not be better writing a complete ithread
> mechanism (including lazy scheduling/context stealing) instead using
> ifilters? I don't know if this is fair, but, commonly, ithread seems
> having better performance than ifilters (when correclty managed).
>
> Attilio
>
>
> --
> Peace can only be achieved by understanding - A. Einstein
>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?b1fa29170606081807xac41117l1f9503a0e247599c>