late continuation of this old thread. Two issues were discussed back then:

(1) A principal shortcoming of QDOS/SMS, that does not allow a highspeed multitasking TCP/IP implementation with an interrupt driven structure.

(2) A problem in QLwIP that occured only when an extremely high number of scheduler calls was made.

The good news: Problem (1) has been solved, thanks to an improvement for QDOS Classic written by Richard Zidlicky. Only few lines of code, but with great effect. It has allowed me to make the lowest driver level interrupt-triggered, without the latency problem when interacting with jobs. I plan more intense testing. Later on, the modification shall be discussed with Mark Swift.

Problem (2) also seems to be solved, as a side-effect of the other modification. Since the cause of the problem never was exactly found, I'm not sure wether this is just luck. But I have transfered several 100 MB of data over the network this evening and the wellknown "hanging" of the HTTPD job at full speed has not yet appeared again, so there's hope.

Kudos to Richard!

All the best

Just by the way, I never was a big fan of the Qubide IDE driver, but I must admit that it is more intelligent than the SMSQ/E driver. While the latter one needed to restrict buffer size for acceptable speed, Qubide can deal with huge buffers, without the "crawling slaveblock" effect. (Helpful for the HTTP server.)

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