Full nohz on TCI6638k2k (KeyStone II)

Full nohz on TCI6638k2k (KeyStone II)

[Mats Liljegren]

I would like to perform a customer demo running a benchmark
application in full nohz mode on TCI6638k2k target, which as far as I
understand it is a KeyStone II architecture.

Does anyone know what the best Linux source code is to perform the
nohz port for this board? It should preferably be Linux 3.9 of any RC
level, but 3.8 should work as well.

I also need a hardware timer to be used as an interrupt source for the
interrupt latency measurements. Any suggestions for framework or
driver to use?

/Mats

Re: [meta-ti] Full nohz on TCI6638k2k (KeyStone II)

[William Mills]

On 04/26/2013 03:06 AM, Mats Liljegren wrote:
> I would like to perform a customer demo running a benchmark
> application in full nohz mode on TCI6638k2k target, which as far as I
> understand it is a KeyStone II architecture.
>
> Does anyone know what the best Linux source code is to perform the
> nohz port for this board? It should preferably be Linux 3.9 of any RC
> level, but 3.8 should work as well.
>
> I also need a hardware timer to be used as an interrupt source for the
> interrupt latency measurements. Any suggestions for framework or
> driver to use?
>

Mats,

The team is just now rebasing the bringup work on 3.8.4.  You can find 
their work here:
http://arago-project.org/git/projects/?p=linux-keystone.git;a=shortlog;h=refs/heads/release-server/master

(The word "server" ~= 3.8 for this archive)

Please note that all the master branches are rebuilt from the feature 
branches in the nightly build script.  I think the feature branches get 
rebased also.  The tags of course you can count on.

The A15's use the per-core archetecture timer normally.  However the SOC 
has multiple (20) Timer64 peripherals that can be used as well if they 
are not being used by the DSPs.  If you configure which timer64 to use 
w/ device tree you should be fine.

Bill

Re: [meta-ti] Full nohz on TCI6638k2k (KeyStone II)

[Mats Liljegren]

On Fri, Apr 26, 2013 at 5:45 PM, William Mills <wmills@ti.com> wrote:
> On 04/26/2013 03:06 AM, Mats Liljegren wrote:
>>
>> I would like to perform a customer demo running a benchmark
>> application in full nohz mode on TCI6638k2k target, which as far as I
>> understand it is a KeyStone II architecture.
>>
>> Does anyone know what the best Linux source code is to perform the
>> nohz port for this board? It should preferably be Linux 3.9 of any RC
>> level, but 3.8 should work as well.
>>
>> I also need a hardware timer to be used as an interrupt source for the
>> interrupt latency measurements. Any suggestions for framework or
>> driver to use?
>>
>
> Mats,
>
> The team is just now rebasing the bringup work on 3.8.4.  You can find their
> work here:
> http://arago-project.org/git/projects/?p=linux-keystone.git;a=shortlog;h=refs/heads/release-server/master
>
> (The word "server" ~= 3.8 for this archive)
>
> Please note that all the master branches are rebuilt from the feature
> branches in the nightly build script.  I think the feature branches get
> rebased also.  The tags of course you can count on.
>
> The A15's use the per-core archetecture timer normally.  However the SOC has
> multiple (20) Timer64 peripherals that can be used as well if they are not
> being used by the DSPs.  If you configure which timer64 to use w/ device
> tree you should be fine.
>
> Bill

Thanks! I'll check it out.

/Mats