>> well, if i understand the rt howto correctly, _no_ disc access is >> allowed, neither from rt nor from non-rt threads, since it may produce >> page faults, which introduce latencies ... > > I would be supprised if the rt howto states that page-faults in non-rt > threads is a critical problem - that would not significantly impact RT > performance - atelast not the worst case - it will (as every other system > load) impact the average case. so having a non-rt thread reading disk-files > to a buffer and a rt-thread processing this buffer should be perfectly fine. that is what i thought for years ... but according to [1] a page fault in an rt process freezes the entire process with both rt and non-rt threads until the page fault is handled ... tim [1] http://rt.wiki.kernel.org/index.php/HOWTO:_Build_an_RT-application#Latencies_caused_by_Page-faults -- tim@xxxxxxxxxx http://tim.klingt.org Your mind will answer most questions if you learn to relax and wait for the answer. William S. Burroughs
Attachment:
signature.asc
Description: OpenPGP digital signature
