Re: (Off-topic) Real-Time kernels on ARM

[J.D. Bakker]

At 16:36 +0200 04-10-1999, Adam 'WeirdArms' Wiggins wrote:
>       Priority is build into L4 it uses hard priority with round robin
>on the same priority level. After thinking about the pre-emption issue
>though I'm not sure its needed since the critical syscall IPC is about 1us
>on a 100Mhz mips machine I hope to get something similar for the SA-1100.

For reference:

bash-2.01# ./lat_syscall null
Simple syscall: 0.6472 microseconds

This on a 220MHz SA-1100, kernel 2.2.12, with not-quite-tuned 60ns EDO
DRAM, using lat_syscall from lmbench. Surely L4 can beat that ;-)

JDB.

--
If you think the problem is bad now, just wait until we've solved it.
                                                     -- Arthur Kasspe


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