Testing Precise Pangolin Beta2 - Page 2

04-07-2012, 12:42 PM

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On Sat, 7 Apr 2012 05:26:23 -0700 (PDT)
Gustavo R Leal <gustavo.leal@yahoo.com.br> wrote:

> De: Gustavo R Leal <gustavo.leal@yahoo.com.br>
> Para: Xubuntu Development Discussion <xubuntu-devel@lists.ubuntu.com>
> Enviadas: Quarta-feira, 28 de Março de 2012 21:46
> Assunto: Re: Testing Precise Pangolin Beta2
>
>
> I've tested Xubuntu 12.04 i386 desktop with manual partitioning and found some bugs. I couldn't login to site to report them.
>
> (...)
>
> 4. memory comsuption seems to be weird, but it is a bug I've found with some 12.04 variants. Kernel bug?
>
>
> __________________________________________________ ________
>
> The problem I was referring is a lot of disk access trashing the system with only 600MB (- buffers/cache) of memory used (on a 1GB system). It seems to vanish with kernel version*linux-image-3.2.0-22-generic-pae. Now I can open all the software available with Xubuntu by default and the system is still responsive.
>
> I think it's a bug with the *non PAE* kernel, as it happens too with Ubuntu 12.04 beta2.
>
> I will try changing the kernel version to non PAE on Ubuntu 12.04 and will report here.
>
> Maybe it's a good idea to use de PAE kernel by defaut.
>
> Thanks,*
> * Gustavo Rybarczyk.

If it is happening in both Xubuntu and Ubuntu i386, it is not the
kernel, since Xubuntu is using the non-pae kernel and Ubuntu is using
the PAE kernel.

- --
Charlie Kravetz
Linux Registered User Number 425914 [http://counter.li.org/]
Never let anyone steal your DREAM. [http://keepingdreams.com]
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04-07-2012, 01:54 PM

>If it is happening in both Xubuntu and Ubuntu i386, it is not the
>kernel, since Xubuntu is using the non-pae kernel and Ubuntu is using
>the PAE kernel.

>- --
>Charlie Kravetz
>Linux Registered User Number 425914* * * * * [http://counter.li.org/]
>Never let anyone steal your DREAM.* * * * * [http://keepingdreams.com]

That's right I've updated Ubuntu kernel to 3.2.0-22-generic-pae and the problem is gone.

Thanks,
** Gustavo Rybarczyk

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04-24-2012, 01:22 AM

I believe I've found the problem of excessive swapping with 1GB of memory.
There is a script "/usr/lib/pm-utils/power.d/laptop-mode" that is setting these weird values to VM tunable kernel parameters when on
AC power:
dirty_background_ratio=5
dirty_ratio=10

The line 69 of the script is the following:
* * * * write_values 0 10 5 500
Changing the line with these values resulted in being able to run the system with 1GB without swap and good performance.
* * * * write_values 0 90 20 500

I think it needs some attention.
Thanks,* Gustavo Rybarczyk.

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04-24-2012, 02:57 PM

On 04/24/2012 04:22 AM, Gustavo R Leal wrote:

I believe
I've found the problem of excessive swapping with
1GB of memory.

There is a
script "/usr/lib/pm-utils/power.d/laptop-mode"
that is setting these weird values to VM tunable
kernel parameters when on AC power:

dirty_background_ratio=5

dirty_ratio=10

The line 69 of the script is the
following:

* * * * write_values 0 10 5 500

Changing the line with these values resulted
in being able to run the system with 1GB without
swap and good performance.

* * * * write_values 0 90 20 500

I think it needs some attention.

Thanks,
* Gustavo Rybarczyk.

Hey Gustavo,

can you file a bug and paste a link it to this mailing list?

Thanks,

Pasi

--
Pasi Lallinaho (knome) » http://open.knome.fi/
Leader of Xubuntu and Shimmer Project »*http://shimmerproject.org/
Graphic artist, webdesigner, Ubuntu member » http://xubuntu.org/

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04-24-2012, 02:59 PM

On 04/24/2012 05:57 PM, Pasi Lallinaho wrote:

On 04/24/2012 04:22 AM, Gustavo R Leal wrote:

I believe
I've found the problem of excessive swapping
with 1GB of memory.

There is a
script "/usr/lib/pm-utils/power.d/laptop-mode"
that is setting these weird values to VM tunable
kernel parameters when on AC power:

dirty_background_ratio=5

dirty_ratio=10

The line 69 of the script is the
following:

* * * * write_values 0 10 5 500

Changing the line with these values
resulted in being able to run the system with
1GB without swap and good performance.

* * * * write_values 0 90 20 500

I think it needs some attention.

Thanks,
* Gustavo Rybarczyk.

Hey Gustavo,

can you file a bug and paste a link it to this mailing list?

Thanks,

Pasi

--
Pasi Lallinaho (knome) » http://open.knome.fi/
Leader of Xubuntu and Shimmer Project »*http://shimmerproject.org/
Graphic artist, webdesigner, Ubuntu member » http://xubuntu.org/

Actually, please just report a test in the ISO testing tracker and
register the bug there and we'll catch it automatically.

Thanks again,

Pasi

--
Pasi Lallinaho (knome) » http://open.knome.fi/
Leader of Xubuntu and Shimmer Project »*http://shimmerproject.org/
Graphic artist, webdesigner, Ubuntu member » http://xubuntu.org/

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