On 11/17/2011 01:57 AM, Lou, Yuanzhi wrote:
> InXenomai’s native/task.h define as：
>
> #define T_CPU(cpu) (1 << (24 + (cpu & 7))) /* Up to 8 cpus [0-7] */
>
> #define T_CPUMASK 0xff00
>
> Which means Xenomai only can support 8 cores at most?
The Xenomai core has no internal limit on the number of cores beyond the
one Linux defines by CONFIG_NR_CPUS. However, the locking model we use
has a low overhead (code and complexity) with few CPUs used in real-time
mode, at the expense of being sub-optimal with a large number of CPUs.
The API you mention simply reflects that fact.
Again: this design affects the number of CPUs used in real-time mode
(i.e. primary Xenomai mode), not necessarily the overall number of CPUs
present in the system and only available to regular Linux processing.
>
> BRs
>
> Lou Yuanzhi
>
>
>
> ___
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--
Philippe.
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