Messages in this thread | | | Date | Thu, 31 Aug 2006 15:42:48 -0700 | From | Greg KH <> | Subject | Re: [RFC] Simple userspace interface for PCI drivers |
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On Thu, Aug 31, 2006 at 05:24:30PM +0400, Manu Abraham wrote: > Usually in the typical application we have (where latency is an issue), > most probably many of the people have a saturated PCI bus. In most > cases, the IPTV guys have such a scenario. Say > 6 or 7 DVB adapters and > the latency goes very high.
Sure, when you are pushing your hardware to the maximum, you should expect issues like this. I agree we should do as best as we can for things like this, but when you over-subscribe your PCI bus by doing something like this, I really recommend just buying some hardware that will work better for you (separate PCI busses, etc. The hardware is out there to do this properly.)
> What i have seen is that when the bus gets saturated, the CPU usage > shoots of rather abnormally.
As is to be expected.
> When the latency goes higher, the resultant stream is useless and > packets needs to be dropped, eventually that results in Transport > Stream discontinuities.
Sure, that's understandable.
> Currently we already have a latency issue, based on the loud cries > from some people.
Trying to do things the hardware is not ment to do, should not result in cries from users :)
thanks,
greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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