Messages in this thread | | | Date | Sun, 19 Feb 2006 06:57:16 +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 15:24 Thu 16 Feb , s.schmidt@avm.de wrote: > We are pleased to note that the GPL_EXPORT_SYMBOL fix has been withdrawn. > This is particularly important for customers who have been relying on good > driver coverage for ISDN/DSL devices with SUSE distributions over the past > few years. However, as we understand the ongoing discussion, a number of > people are tending towards a position of enforcement of USB GPL drivers > only. We would like to take this opportunity to clarify where we see the > 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.
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