Messages in this thread | | | Date | Tue, 6 Dec 2011 11:21:53 +0000 | From | Mark Brown <> | Subject | Re: [RFC] vtunerc: virtual DVB device - is it ok to NACK driver because of worrying about possible misusage? |
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On Mon, Dec 05, 2011 at 09:41:38PM +0100, Andreas Oberritter wrote: > On 05.12.2011 18:39, Mauro Carvalho Chehab wrote:
> > When you put someone via the network, issues like latency, package > > drops, IP > > congestion, QoS issues, cryptography, tunneling, etc should be taken > > into account > > by the application, in order to properly address the network issues.
> Are you serious? Lower networking layers should be transparent to the > upper layers. You don't implement VPN or say TCP in all of your > applications, do you? These are just some more made-up arguments which > don't have anything to do with the use cases I explained earlier.
For real time applications it does make a big difference - decisions taken at the application level can greatly impact end application performance. For example with VoIP on a LAN you can get great audio quality by using very little compression at the expense of high bandwidth and you can probably use a very small jitter buffer. Try doing that over a longer distance or more congested network which drops packets and it becomes useful to use a more commpressed encoding for your data which may have better features for handling packet loss, or to increase your jitter buffer to cope with the less reliable transmit times.
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