loadavg question

loadavg question

[Boszormenyi Zoltan]

Hi,

on an embedded PC (500MHz AMD Geode), we recently tried
to upgrade the kernel. The original version was 2.6.27, the new
ones were 3.3.x and 3.7.x. With the same userspace (a GTK based
GUI constantly querying daemons handling different pieces of
hardware over serial ports), we noticed that loadavg is different
while the idle time (95-97%) is the same. On 2.6.27, the load was
around 0.05-0.3 while on 3.3.x and 3.7.x, it quickly crawled up
to around 5. Has the load calculation changed so dramatically
after 2.6.27?

Thanks in advance,
Zoltán Böszörményi

Re: loadavg question

[Boszormenyi Zoltan]

Hi,

yes, that commit is in my kernel 3.7.9 kernel source, but not in 3.3.2.
Also, I have CONFIG_NO_HZ=n in my .config. I will retry with
CONFIG_NO_HZ=y with 3.7.9.

Thanks,
Zoltán Böszörményi

2013-02-28 15:05 keltezĂŠssel, Azat Khuzhin Ă­rta:
>
> Hi,
>
> Could you check do you have commit that mentioned here?
> http://comments.gmane.org/gmane.linux.kernel/1346108
>
> Respectfully
> Azat Khuzhin.
> >From phone.
>
> On Feb 28, 2013 4:40 PM, "Boszormenyi Zoltan" <zboszor@pr.hu <mailto:zboszor@pr.hu>> wrote:
>
>     Hi,
>
>     on an embedded PC (500MHz AMD Geode), we recently tried
>     to upgrade the kernel. The original version was 2.6.27, the new
>     ones were 3.3.x and 3.7.x. With the same userspace (a GTK based
>     GUI constantly querying daemons handling different pieces of
>     hardware over serial ports), we noticed that loadavg is different
>     while the idle time (95-97%) is the same. On 2.6.27, the load was
>     around 0.05-0.3 while on 3.3.x and 3.7.x, it quickly crawled up
>     to around 5. Has the load calculation changed so dramatically
>     after 2.6.27?
>
>     Thanks in advance,
>     ZoltĂĄn BĂśszĂśrmĂŠnyi
>
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