Re: F13: Delay in screen refresh

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On Mon, May 31, 2010 at 10:51 AM, Mike Fleetwood
<mike.fleetwood@xxxxxxxxxxxxxx> wrote:

[... cut ...]

> Hi Marco,
>
> I'm no expert but it sound to me like you have a latency issue.  For
> some reason your machine is sometimes having to wait 1 to 4 seconds
> before it can give a program (vim, bash, etc.) its CPU time slice,
> hence the apparent delay.
>
> I have seen this kind of thing before when the kernel has to re-try
> disk I/O multiple times on a failing hard drive.
>
> Suggestions:
> 1) Play music!  If it pauses when your app pauses it is an OS wide
> issue effecting everything.

I will try tonight at home

> 2) Run top in another window.  When top refreshes after the pause does
> any process jump to the top?

No process seems to have a great impact on CPU usage.
These below are the more time consuming processes:

 1563 root      20   0  172m  42m  11m S  3.6  2.1   4:39.59 Xorg
 2751 marco    20   0  942m 173m  30m S  3.6  8.7   4:32.69 firefox
 2790 marco    20   0  419m  19m  10m S  2.0  1.0   2:11.23 npviewer.bin

After refresh, Xorg goes from 1.0 to 2.5 % of CPU. This percentage
increase to ~16% when I switch between wm virtual desktops.

> 3) Check /var/log/messages for any errors.
>

Done, but no meaningful information (or maybe I don't know what to look for).

> Vague ideas:
> 4) Google for investigating latency issues.
> 5) With modern kernels I guess it should be possible to dynamically
> trace it to find the lateny issue, but I have no idea how.
>
> Sorry I can't be more help,
> Mike

Thank you very much for your help.
Hope someone other can help me :)

In addition to system information provided in previous email I add
that my notebook is a DELL Latitude D830

Cheers,

-- Marco
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