Date: Thu, 24 Sep 1998 18:52:41 -0400 (EDT) From: Simon Shapiro <shimon@simon-shapiro.org> To: Eivind Eklund <eivind@yes.no> Cc: Adam McDougall <mcdougall@ameritech.net>, current@FreeBSD.ORG, "Justin T.Gibbs" <gibbs@plutotech.com> Subject: Re: options DPT_LOST_IRQ Message-ID: <XFMail.980924185241.shimon@simon-shapiro.org> In-Reply-To: <19980924213043.19742@follo.net>
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Eivind Eklund, On 24-Sep-98 you wrote:
> On Thu, Sep 24, 1998 at 12:30:29PM -0600, Justin T. Gibbs wrote:
> > >This option is necessary due to interrupts being eaten by the serial
> > >driver 'fast interrupt' code (which in some cases blocks interrupts
> > >longer than the DPT assert them).
> >
> > Wow. I thought that the fast interrupt code could only cause
> > interrupts
> > to be deferred, never eaten. Did anyone ever talk to Bruce about this?
>
> I didn't, at least, as I don't have the relevant equipment to
> reproduce the fault, and didn't learn about it until a month and a
> half ago, when somebody else (outside the FreeBSD camp proper) was
> already working on fixing that code. However, I believe that project
> has been abandoned for the time being. There are (according to my
> source - I don't have SMP and don't know the issues) a bunch of
> problems related to interrupts and SMP.
>
> I don't know if the DPT_LOST_IRQ problem only occur on SMP - Adam, do
> you have SMP?
Happens on SMP, even without serial port activity. On Nomis, we get it
about once an hour.
> > I'd hate to have a situation where lots of drivers each have their own
> > little timeout handler to deal with this problem.
>
> I absolutely agree. However, no matter what, it is better for the DPT
> to work (with that kind of kludge) than for it to die.
>
> Eivind.
>
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Sincerely Yours, Shimon@Simon-Shapiro.ORG
770.265.7340
Simon Shapiro
Unwritten code has no bugs and executes at twice the speed of mouth
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