Messages in this thread | | | Date | Sun, 19 Feb 2006 12:02:20 -0500 (EST) | From | Steven Rostedt <> | Subject | Re: 2.6.16 serious consequences / GPL_EXPORT_SYMBOL / USB drivers of major vendor excluded |
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On Sun, 19 Feb 2006, Sasha Khapyorsky wrote:
> 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 We are pleased to note that the GPL_EXPORT_SYMBOL fix has been withdrawn.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. >
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.
but...
I would be really interested in knowing how much better a user side driver can work with the -rt patch implemented. I bet it can do rather well.
-- Steve
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