[laptop-mode] Enabling Laptop Mode Activate Pdflush Every 3-4 Seconds

[Casey McGinty]

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On Tue, May 26, 2009 at 10:40 PM, Ritesh Raj Sarraf <rrs at researchut.com>wrote:

>
> I looked into the kernel source and it is related to a dvb driver.
>
> This is what is getting triggered as part of your driver.
>
>    if (ret != 2) {
>        printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error
> (ret == %i)\n", __func__, state->config->demod_address, reg, ret);
>
> With syslogd running, this message will be logged to syslog, which would
> then
> trigger an write.
>
> The only question is, how much of this message is being written and how
> frequently.
>
> With laptop-mode enabled, when a daemon/driver logs to syslog, when is a
> pdflush triggered and after how much of dirty pages?
>
>
Yes, I have a DVD device running. I can disable and try again. It is running
through mythTV, but I didn't have any active clients or connections when I
started the test.

The other prcocess is VmWare service running in the background. Again, I
might of accidentally had my VM running when I tested, but it was not in use
at the time.

I agree that all of these items should not be running during the test,
however, I still have the condition that once laptop mode is enabled, the
drive writes go from almost nothing to frequent bursts every few seconds.
I'll try and test again in a few minutes.

- Casey

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<br><br><div class=3D"gmail_quote">On Tue, May 26, 2009 at 10:40 PM, Ritesh=
 Raj Sarraf <span dir=3D"ltr">&lt;<a href=3D"mailto:rrs at researchut.com">rrs=
@researchut.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" =
style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8=
ex; padding-left: 1ex;">
<br>
I looked into the kernel source and it is related to a dvb driver.<br>
<br>
This is what is getting triggered as part of your driver.<br>
<br>
 =A0 =A0if (ret !=3D 2) {<br>
 =A0 =A0 =A0 =A0printk(KERN_WARNING &quot;lgdt330x: %s: addr 0x%02x select =
0x%02x error<br>
(ret =3D=3D %i)\n&quot;, __func__, state-&gt;config-&gt;demod_address, reg,=
 ret);<br>
<br>
With syslogd running, this message will be logged to syslog, which would th=
en<br>
trigger an write.<br>
<br>
The only question is, how much of this message is being written and how<br>
frequently.<br>
<br>
With laptop-mode enabled, when a daemon/driver logs to syslog, when is a<br=
>
pdflush triggered and after how much of dirty pages?<br>
<br></blockquote></div><br>Yes, I have a DVD device running. I can disable =
and try again. It is running through mythTV, but I didn&#39;t have any acti=
ve clients or connections when I started the test.<br><br>The other prcoces=
s is VmWare service running in the background. Again, I might of accidental=
ly had my VM running when I tested, but it was not in use at the time.<br>
<br>I agree that all of these items should not be running during the test, =
however, I still have the condition that once laptop mode is enabled, the d=
rive writes go from almost nothing to frequent bursts every few seconds. I&=
#39;ll try and test again in a few minutes.<br>
<br>- Casey<br>

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