On Dec 10 14:37, Estabrook, Edward wrote: >> Generally I am seeking information regarding: >> 1) Where can I download and install an older version of Cygwin (say >> 1.5 era) to test if the problem is newly introduced? > > Corinna wrote: What for? If it doesn't work on 1.5 you're exactly at the same spot as >now. If it works on 1.5, we know it works on 1.5 but we still don't >know why it doesn't work on 1.7, which means, you're still exactly at >the same spot as now. So that's not really an option. The best option >is either to debug the (slim) layer in Cygwin which provides send/recv, >or at least to send an as-simple-as-possible, self-sufficient testcase, >preferredly in plain C, which allows to reproduce the problem.
Two reasons. If it works on 1.5, I'll simply use it to perform my testing and the time-pressure to solve the root cause is lessened. Whether it works or not, it'll tell me if the issue is a change between those versions or something older. (Plus the build instructions and distributed executable are for SIPp are written with cygwin 1.5 in mind. The setup-legacy installer for older versions of Windows is exactly what I needed. I tested this out and confirmed the issue exists in the old version as well. >> 2) What tools are available to measure potential packet loss within >> cygwin itself? (the Windows stack is not reporting dropped UDP >> packets, and the packets are not even making it into a locally running >> instance of wireshark). Is there a way to dump / access / sniff the >> inputs and outputs to the cygwin IP stack? Traffic volume is low so >> verbosity would not pose a problem. > > Corinna wrote: >You can add debug output to Cygwin's send and receive functions and use >strace. OK, thanks. I see debug_printf() and syscall_printf() statements sprinkled around the source. Where do these end up displayed / logged? How are they enabled? > Corinna wrote: >Apart from actual debugging it yourself, a testcase, as outlined above, >might be helpful. The details describe *what* happens, but unfortunately >don't even allow to guess *why* it happens. Understood. I need to perform more investigation before I can guess why, either. Best Regards, Ed -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
