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    SubjectRe: 2.6.16 serious consequences / GPL_EXPORT_SYMBOL / USB drivers of major vendor excluded
    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 We are pleased to note that the GPL_EXPORT_SYMBOL fix has been withdrawn.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.

    Regards,
    Sasha.
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