Messages in this thread | | | Date | Mon, 20 Feb 2006 05:11:30 +0200 | From | Sasha Khapyorsky <> | Subject | Re: 2.6.16 serious consequences / GPL_EXPORT_SYMBOL / USB drivers of major vendor excluded |
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On 12:02 Sun 19 Feb , Steven Rostedt wrote: > > > > differences between AVM and other devices and the difficulties regarding a > > > possible move towards user mode. > > > > > > The user space does not ensure the reliability of time critical analog > > > services like Fax G3 or analog modem emulations. This quality of service > > > can only be guaranteed within the kernel space. > > > > Soft modems may work pretty well in userspace - slmodem is example. > > > > Real-time requirement for V.34 is 40ms response time and only once during > > the session when echo canceller parameters are negotiatiated (so you may > > decrease "buffer size" before and increase after - there are enouph > > silence places for such manipulations). Fax itself does not require any > > "realtime" AFAIK, other place is almost unused today V.32 - 26ms, also > > for echo canceller setup. > > > > Disclaimer: This is in no way a push to get the -rt patch into mainline > at the moment. The patch is still young and is not ready yet.
Hmm, it was not about -rt patch - 40 millisecond response time is realistic for userspace even without -rt patch. There is no guarantee, but in practice this may work very well and keep low percents of failures (much lower than permitted by standards).
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