Hi,
I am working on xmos avb board for audio processing and I am using talker and listener seperately.
I have a question regarding thread_fast_mode, on my listener hardware, I have two tiles running 8 threads each. tile 0 runs for listener, media clock server and tile 1 runs the ethernet stuff and ptp.
I know that we have this thread_fast_mode_on function which makes a particular thread run faster compare to other threads.
I need information regarding this, whether this thread_fast_mode supports only one thread in both the tiles or each tile can run one thread in thread_fast_mode
Thanks in advance
REgarding thread fast mode
Hi, the thread (or core rather) doesn't run any faster - it is just always scheduled in the pipeline.
From the XS1 Architecture Manual:
This mode does have a drawback in that it can reduce the MIPS available to other cores. Since the core in fast mode is always re-issuing it's paused instruction.
In reality the speed-up is very small - so I would not concern yourself with this mode unless you are very on the edge (like within a cycle or two) or you *really* know what you are doing.
From the XS1 Architecture Manual:
(Yes I realise "fast" mode is not a great name. Maybe think of it as "fast response" mode)To enable the virtual processor to perform one input or output per virtual cycle, a fast- mode is provided. When a thread is in fast-mode, it is not de-scheduled when an instruction can not complete; instead the instruction is re-issued until it completes.
This mode does have a drawback in that it can reduce the MIPS available to other cores. Since the core in fast mode is always re-issuing it's paused instruction.
In reality the speed-up is very small - so I would not concern yourself with this mode unless you are very on the edge (like within a cycle or two) or you *really* know what you are doing.