Messages in this thread | | | Subject | Re: [ANNOUNCE] Linux 2.6 Real Time Kernel | From | Lee Revell <> | Date | Sun, 10 Oct 2004 13:26:55 -0400 |
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On Sun, 2004-10-10 at 08:21, John Richard Moser wrote:
> Does any of this 'work' on x86_64 yet? I heard that Ingo's voluntary > pre-empt was x86 only and didn't work on amd64; this stuff's kinda new, > does it work outside x86 yet? > > I'd like to see what these kinds of things do. :)
The VP patches currently work on x86, x64, amd64, and ppc AFAIK. As stated in the docs, the MontaVista stuff is x86 only right now.
My tests show the worst case latency with the MontaVista patches is about twice that of the VP patches. Probably due to debug overhead and a bug or two. But, as expected, the average case latency is _much_ better.
Here's the top of the VP histogram, delay is in usecs:
Delay # 0 5764433 1 3154867 2 461521 3 332445 4 403847 5 320120 6 237955 7 152418 8 94274 9 66496 10 52976 11 44605 12 38437 13 31620 14 27816 15 26845 16 23743 17 20648 18 21611 19 24853 20 30352 21 50046 22 101989 23 24843 24 28829 25 56247 26 42408 27 28228 28 20773 29 19521
Here's the top of the Mvista histogram:
Delay # 0 6771692 1 26 2 29 3 12 4 15 5 15 6 15 7 18 8 19 9 10 10 15 11 10 12 19 13 12 14 15 15 11 16 13 17 13 18 11 19 13 20 12 21 9 22 11 23 13 24 17 25 10 26 9 27 11 28 8 29 12
Lee
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