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Date:      Wed, 15 Apr 2009 23:40:24 +0200
From:      Paolo Pisati <p.pisati@oltrelinux.com>
To:        Marcel Moolenaar <xcllnt@mac.com>
Cc:        arch@freebsd.org
Subject:   Re: Enabling interrupt filters by default
Message-ID:  <49E65448.4090302@oltrelinux.com>
In-Reply-To: <A3D36F50-C823-41CB-9681-7C87A9BCDFDE@mac.com>
References:  <200904151324.06754.jhb@freebsd.org>	<16C23095-4023-499D-896C-8A7A478FDCE4@mac.com>	<200904151613.50568.jhb@freebsd.org> <A3D36F50-C823-41CB-9681-7C87A9BCDFDE@mac.com>

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Marcel Moolenaar wrote:
>
> August 2007.
AFAIK there were different menaces to turn it on
but i was never done.
>
> There was interrupt starvation on sparc64. 
there were problems with some bridges back then,
but i don't know the status today: you could try
and tell us :)

> There were also
> issues with permanently masking stray interrupts. This is
> problematic when interrupts are shared and there is at least
> 1 filter on it.
IIRC that was my mistake trying to cool down interrupt storms,
and that piece of code was removed.



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