Re: [hylafax-users] IRQ Overload

["Mike Brentlinger" <msbrentlinger@xxxxxxxxx>]

Thanks much for the response.. Ill look into reporting the issue to my
kernel maintainer.

You mention below mainpine is trying to create a work-around? Im
curious do you have any idea what form that work-around will take? An
update to the fax boards firmware or some such thing or some
alternative serial driver for linux?

Thanks again
-Mike




On Fri, Sep 12, 2008 at 2:35 PM, Lee Howard <lee.howard@xxxxxxxxxxxx> wrote:
> I've had numerous conversations with a few people regarding this topic...
> Furthermore, I've done a lot of research on it... And I still don't know
> for-certain what the problem is or how, exactly, to fix it.
>
> What seems clear, however, is that there is a bug in the kernel serial
> driver that is, for some reason, more prominent on newer kernel versions and
> is, for some reason, more prominent when using high port-count IQ Express
> fax cards (although there have been reports of this kind of thing using
> other serial hardware and software).
>
> There was a confirmed bug report with two patches from Robert Evans of
> Stratus Technologies that circulated on the linux-serial mailing list on 13
> August that dealt specifically with SMP systems.  (The systems on which I've
> reproduced this problem have all been SMP.)  I do not know if the patches
> were ever committed to the Linux kernel source repository - although one is
> apparently in the RedHat 5.2 version - or if they will be making it in to a
> subsequent kernel release.  Furthermore, I do not know if the patches will
> resolve the matter.  (I have not tested them.)
>
> http://article.gmane.org/gmane.linux.serial/2633
>
> Mainpine has chosen to develop a work-around to the problem which won't be
> available for another few weeks.  Please check back with me for updates on
> that.  Meanwhile, I would suggest reporting a bug to the kernel maintainer
> for your distribution.  Please do point them at the above-mentioned URL.
> Hopefully they can provide you with a patched kernel which you could test.
>
> Thanks,
>
> Lee.
>
> Lee Howard
> Mainpine, Inc. Software Development Lead
> Tel: +1 866 363 6680 ext 5 | Fax: +1 360 462 8160
> lee.howard@xxxxxxxxxxxx | www.mainpine.com
>
> -----Original Message-----
> From: msbrentlinger@xxxxxxxxx [mailto:msbrentlinger@xxxxxxxxx]
> Sent: Friday, September 12, 2008 11:04 AM
> To: Lee Howard
> Cc: hylafax-users@xxxxxxxxxxx
> Subject: Re: IRQ Overload
>
>
> I have the same issue as well.. Did anyone ever come to some resolution to
> this issue?
>
> I have HylaFAX (tm) Version 5.2.7 from hylafax-5.2.7-1.fc9.i386.rpm
> installed on Fedora release 9 (Sulphur) 2.6.25-14.fc9.i686 with a Mainpine
> IQ Express 8-port (Low Profile) RF2123
>
>
> at night we send a batch of anywhere from a few dozen to a few hundred
> faxes, things start off fine and then.
>
> /var/log/messages starts showing
> Sep 11 20:33:10 hylafax kernel: serial8250: too much work for irq16 Sep 11
> 20:33:10 hylafax kernel: serial8250: too much work for irq16 Sep 11 20:33:10
> hylafax kernel: serial8250: too much work for irq16 Sep 11 20:33:10 hylafax
> kernel: serial8250: too much work for irq16 Sep 11 20:33:10 hylafax kernel:
> serial8250: too much work for irq16 Sep 11 20:33:10 hylafax kernel:
> serial8250: too much work for irq16 Sep 11 20:33:10 hylafax kernel:
> serial8250: too much work for irq16 ...
> ...
>
> shortly there after the remaining faxes that are queued up go out start
> failing with' too many attempts to dial'.
>
> Eventually things seem to resolve itself because in the morning things are
> going fine again without any reboots or anything. Throughout the day we do
> send occasional faxes, but maybe 2-3 at a time every 10 minutes or so...
> Nothing like our larger night batches of a couple hundered that get queued
> up all at once.
>
>
>
>
>


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