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Date: Fri, 2 Jun 2006 12:42:23 +0200
From: "Attilio Rao" <asmrookie@gmail.com>
To: "M. Warner Losh" <imp@bsdimp.com>, "Hans Petter Selasky" <hselasky@c2i.net>,
	"John Baldwin" <jhb@freebsd.org>, kmacy@freebsd.org, perforce@freebsd.org
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Cc: 
Subject: Re: PERFORCE change 98153 for review
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2006/6/2, M. Warner Losh <imp@bsdimp.com>:
> In message: <200606020856.11054.hselasky@c2i.net>
>             Hans Petter Selasky <hselasky@c2i.net> writes:
> : On Friday 02 June 2006 02:26, 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.
> : >
> :
> : As long as your code is not Giant locked, the standard interrupt handlers
> : should not be that slow?
>
> They are very slow compared to a FAST interrupt handler, since there's
> a full context switch :-(

... and since there's no context stealing (or, in another way, lazy
scheduling for interrupt handlers is not implemented as it might be).

Attilio


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