io CPU usage high

io CPU usage high

[Cliff Brake]

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I've noticed with recent Angstrom images running on OMAP class CPUs, it
seems the IO CPU usage is very high when running from SD cards.  When there
is a lot of disk activity, the system becomes fairly unresponsive, and CPU
io usage is usually pegged.  Is this expected?  I don't recall seeing this
with older kernels such as 2.6.39 which I'm using on an older project.

Thanks,
Cliff

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Re: io CPU usage high

[Denys Dmytriyenko]

On Thu, Aug 16, 2012 at 06:11:59PM -0400, Cliff Brake wrote:
> I've noticed with recent Angstrom images running on OMAP class CPUs, it
> seems the IO CPU usage is very high when running from SD cards.  When there
> is a lot of disk activity, the system becomes fairly unresponsive, and CPU
> io usage is usually pegged.  Is this expected?  I don't recall seeing this
> with older kernels such as 2.6.39 which I'm using on an older project.

Cliff,

Do you use kernel-mainline_3.2 from meta-ti that is crafted for beagleboard or 
something else?

Denys

Re: io CPU usage high

[Cliff Brake]

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On Thu, Aug 16, 2012 at 10:21 PM, Denys Dmytriyenko <denys@ti.com> wrote:

> On Thu, Aug 16, 2012 at 06:11:59PM -0400, Cliff Brake wrote:
> > I've noticed with recent Angstrom images running on OMAP class CPUs, it
> > seems the IO CPU usage is very high when running from SD cards.  When
> there
> > is a lot of disk activity, the system becomes fairly unresponsive, and
> CPU
> > io usage is usually pegged.  Is this expected?  I don't recall seeing
> this
> > with older kernels such as 2.6.39 which I'm using on an older project.
>
> Cliff,
>
> Do you use kernel-mainline_3.2 from meta-ti that is crafted for
> beagleboard or
> something else?


Whatever comes from the Angstrom/meta-ti master branch these days:

root@beagleboard:~# cat /proc/version
Linux version 3.2.18 (cbrake@happy.bec-systems.com) (gcc version 4.7.2
20120706 (prerelease) (GCC) ) #1 Thu Aug 16 08:50:30 EDT 2012

I'll try to do more systematic testing ...

Is there another kernel I should try?

Cliff

-- 
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http://bec-systems.com

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Re: io CPU usage high

[Cliff Brake]

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On Fri, Aug 17, 2012 at 8:29 AM, Cliff Brake <cliff.brake@gmail.com> wrote:

> On Thu, Aug 16, 2012 at 10:21 PM, Denys Dmytriyenko <denys@ti.com> wrote:
>
>> On Thu, Aug 16, 2012 at 06:11:59PM -0400, Cliff Brake wrote:
>> > I've noticed with recent Angstrom images running on OMAP class CPUs, it
>> > seems the IO CPU usage is very high when running from SD cards.  When
>> there
>> > is a lot of disk activity, the system becomes fairly unresponsive, and
>> CPU
>> > io usage is usually pegged.  Is this expected?  I don't recall seeing
>> this
>> > with older kernels such as 2.6.39 which I'm using on an older project.
>>
>> Cliff,
>>
>> Do you use kernel-mainline_3.2 from meta-ti that is crafted for
>> beagleboard or
>> something else?
>
>
> Whatever comes from the Angstrom/meta-ti master branch these days:
>
>
this is the version: linux-mainline-3.2.18-r121b


> root@beagleboard:~# cat /proc/version
> Linux version 3.2.18 (cbrake@happy.bec-systems.com) (gcc version 4.7.2
> 20120706 (prerelease) (GCC) ) #1 Thu Aug 16 08:50:30 EDT 2012
>
> I'll try to do more systematic testing ...
>
> Is there another kernel I should try?
>
> Cliff
>
> --
> =================
> http://bec-systems.com
>



-- 
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