[Asterisk-Users] four wildcards in a single pc

[Rich Adamson]

Think we've all have hope the issue will go away, then wouldn't need
to be on the wiki. :)

------------------------
> Rich, thank you so much for taking the time to patiently explain the
> issue.
> 
> I think this ought to be on the wiki for future newbies.
> 
> Thanks.
> 
> 
> > -----Original Message-----
> > From: Rich Adamson [mailto:radamson at routers.com]
> > Sent: Thursday, December 09, 2004 5:39 PM
> > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > Subject: Re: [Asterisk-Users] four wildcards in a single pc
> > 
> > > I have installed successfully more then four cards in a machine
> before.
> > > I had a firewall with eight network interfaces (one quad card, one
> duo
> > > and two singles)
> > > I have machines with two dialogic boards, a pci display card, and a
> > > network interface.
> > > And I know I've had machines at home that had a display adaptor,
> modem,
> > > network, scsi, and soundblaster all together.
> > >
> > > Yet, people claim it won't work because of lack of IRQs, and that
> it's
> > > not related to Digium.
> > >
> > > What am I missing?
> > 
> > There has been a lot of comments over the last 12 months or so
> relative
> > on this. The issue is _not_ the number of interrupts, but rather the
> > ability of those interrupts to handle the flow of data across the bus
> > _without_ injecting delay. That ability seems to be directly related
> > to exactly how the interrupts are handled on _each_ motherboard, and
> > seems to have some relationship to the pci support chips on the
> > motherboard.
> > 
> > There are plenty of implementations that _do_ share interrupts with
> > absolutely no problems, and at least some of those are represented to
> > be rather heavily loaded.
> > 
> > There's also been a fair number of people that have had problems with
> > the latest/fanciest/fastest system, and swapping out the motherboard
> > with a 800 mhz P3 fixed their issues. What else actually changed
> > during that swap? No one knows for sure, but supposedly nothing.
> > 
> > The current list of symptoms/issues reads something like this:
> > - processor speed has little/nothing to do with it
> > - dual vs single processors has nothing to do with it
> > - amount of ram, etc, has nothing to do with it
> > - the linux distro in use has nothing to do with
> > - digium cards expect a solid 1000 interrupts/second/card with no
> >   interrupt service latency
> > - those heavily involved with audio (not voip audio) have known about
> >   pci & interrupt latency issues with certain motherboards. They seem
> >   to be more sensitive to the issues then * is. No one has found
> >   a list of what _they_ consider to be bad boards.
> > - there is no consolidated list of what motherboards work vs don't
> >   partially due to the difficulty of describing boards from vendors
> >   (eg, Dell, HP), and in some cases, different boards used in the
> >   same model number of system.
> > - if a particular motherboard has an issue, the problem typically
> >   appears as echo on pstn calls (one direction only)
> > - there are no tools that anyone has written/found to help identify
> >   which systems/motherboards have issues
> > - although some people represent that digium support is working on
> >   something, those words have been heard before and the problems
> >   still exist (at least for some).
> > 
> > So, it seems the only _reliable_ answer to your question is to try it
> > on whatever hardware you have available.
> > 
> > 
> > 
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> 
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