On 01/31/2014 01:05 AM, Andy Pugh wrote:
> On 19 January 2014 13:42, Gilles Chanteperdrix
> <[email protected]> wrote:
>
>>> Could you try the following patch to see if it improves anything?
>>
>> Sorry, wrong patch version. Please try this one instead:
>
> The patch appears to reduce the latency to about 60uS.
>
> I thought that setenv isolcpus=0 had had an effect, as I opened
> Firefox and didn't see max latency increase over the 45uS it was at,
> but then opening Chromium too pushed it up to 60uS.
>
> Does Xenomai automatically choose the isolated CPU, or is some config needed?
>
> In fact, how do I tell that I have an isolated CPU?
Use the xeno_hal.supported_cpus parameter, it is a bitfield, so 1 is for
cpu 0.
There is more we can do to improve performances on imx6:
- enable more features in the L2 cache auxiliary control register (the
value of this register is passed to the l2x0_init function, and
currently imx6 passes all 0)
- use the L2 cache "lockdown by master" feature, to reserve several
cache ways to the core where xenomai runs.
l2x0_init prints the value of the auxiliary control register at boot,
could you show me the boot logs you get to see which bits exactly are
already enabled?
Regards.
--
Gilles.
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