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 <CAD1Ag0wW0nw-BR1aqKkD66LLO_yndJAy__i6yg9TWvU_Z6QEDA@mail.gmail.com> <20240930202728._Cgmke2m@steffen%sdaoden.eu>
In-Reply-To: <20240930202728._Cgmke2m@steffen%sdaoden.eu>
From: Jerome Marc <marcjero@yahoo.com>
Date: Mon, 30 Sep 2024 23:20:21 +0200
Message-ID: <CAD1Ag0xwXkX7yuanRrcpnSzNCNLXHp9Bx76=HYoecbhCWPpJDw@mail.gmail.com>
Subject: Re: freeze / connection delay after idling for a while ?
To: Jerome Marc <marcjero@yahoo.com>, ~alpine/users@lists.alpinelinux.org
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Hi Steffen,

Thanks !
Unfortunately there is cpupower rc service running and I don't have wifi.
I installed cpupower and got this output :

alpine:~# cpupower frequency-info
analyzing CPU 0:
  driver: cpufreq-dt
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0 1 2 3
  maximum transition latency:  Cannot determine or is not supported.
  hardware limits: 600 MHz - 900 MHz
  available frequency steps:  600 MHz, 700 MHz, 800 MHz, 900 MHz
  available cpufreq governors: conservative ondemand userspace performance
schedutil
  current policy: frequency should be within 600 MHz and 900 MHz.
                  The governor "schedutil" may decide which speed to use
                  within this range.
  current CPU frequency: 600 MHz (asserted by call to hardware)

Looks good...

Le lun. 30 sept. 2024 =C3=A0 22:27, Steffen Nurpmeso <steffen@sdaoden.eu> a
=C3=A9crit :

> Jerome Marc wrote in
>  <CAD1Ag0wW0nw-BR1aqKkD66LLO_yndJAy__i6yg9TWvU_Z6QEDA@mail.gmail.com>:
>  |I just installed Alpine 3.20.3 on a RPI 2 in diskless mode.(headless,
>  |minimal installation)
>  |
>  |I noticed that if I let the device idling, I have a few seconds latency
>  |when I try to connect the machine with SSH for example. Even when
> connected
>  |I can have my SSH session frozen for a few seconds if I do nothing in t=
he
>  |terminal.
>  |I notice the same when using a nodejs app (HTTP) therefore this is a
>  |general thing (not just about SSH)
>  |
>  |I don't see anything weird in logs. Any idea ? Is that a power saving
>  |feature ?
>
> It *could* be that cpupower-openrc is indeed the
> tools/power/cpupower of the linux kernel sources, it seems to be
> widely available (architecture-wise, on Alpine).
> If that is so, then running it should output stuff like
>
>   #?0|kent:~# bin/cpupower.sh
>   analyzing CPU 0:
>     driver: intel_pstate
>     CPUs which run at the same hardware frequency: 0
>     CPUs which need to have their frequency coordinated by software: 0
>     maximum transition latency:  Cannot determine or is not supported.
>     hardware limits: 400 MHz - 3.40 GHz
>     available cpufreq governors: performance powersave
>     current policy: frequency should be within 400 MHz and 3.40 GHz.
>                     The governor "powersave" may decide which speed to us=
e
>                     within this range.
>     current CPU frequency: Unable to call hardware
>     current CPU frequency: 800 MHz (asserted by call to kernel)
>     boost state support:
>       Supported: yes
>       Active: yes
>
> On the reserve laptop however the EFI(BIOS) "always" sets back
> cpupower, and we start with "powersave" governor and low
> frequency, and so the initial decrypting of the hard disk takes
> seeeeconds.  I btw drive it via
>
>   #!/bin/sh -
>   #@ /root/bin/cpupower.sh
>   # cpupower is in Linux src, tools/power/cpupower
>
>   : ${HOSTNAME:=3D$(uname -n)}
>
>   if [ -f /root/hosts/${HOSTNAME}/cpupower ]; then
>           . /root/hosts/${HOSTNAME}/cpupower
>   else
>           logger -s -t /root/bin/cpupower.sh "MISS
> /root/hosts/${HOSTNAME}/cpupower"
>           exit 1
>   fi
>
>   if command -v cpupower >/dev/null 2>&1; then :; else
>           logger -s -t /root/bin/cpupower.sh 'no cpupower tool'
>           exit 1
>   fi
>
>   if [ $# -gt 0 ]; then
>           x=3D
>           case $1 in
>           lo) x=3D$lo;;
>           med) x=3D$med;;
>           hi) x=3D$hi;;
>           default) x=3D$default;;
>           75) x=3D$x75;;
>           *) echo >&2 'Synopsis: cpupower [lo|med|hi|default[|75]]';;
>           esac
>           [ -n "$x" ] && cpupower frequency-set -u $x
>   fi
>
>   cpupower frequency-info
>
> and that /root/hosts/$HOSTNAME/cpupower is (here)
>
>   #@ /root/hosts/self/cpupower
>   lo=3D'400M -g powersave'
>   med=3D'1600M -g powersave'
>   hi=3D'3400M -g performance'
>   default=3D'3400M -g powersave'
>   x75=3D'2500M -g performance'
>
> (i use "hi" only for kernel and port builds).
> It makes "a hell of a difference".
>
> Other than that i have seen similar things because (a) the
> kernel's crng came up slowly (up to 30 minutes at times), but this
> *should* be a thing of the past (dunno Alpine 3.20, i always use
> [edge]), or because of WiFi chip powersafe stuff, i usually do
> that though, i use "iw dev $dev set power_save on":
>
>   # iw dev wlp1s0 get power_save
>   Power save: on
>
> Other than that i am out of ideas.
>
> --steffen
> |
> |Der Kragenbaer,                The moon bear,
> |der holt sich munter           he cheerfully and one by one
> |einen nach dem anderen runter  wa.ks himself off
> |(By Robert Gernhardt)
>

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<div dir=3D"ltr">Hi Steffen,<div><br><div>Thanks !</div><div>Unfortunately =
there is cpupower rc service running and I don&#39;t have wifi.</div></div>=
<div>I installed cpupower and got this output=C2=A0:</div><div><br></div><d=
iv>alpine:~# cpupower frequency-info<br>analyzing CPU 0:<br>=C2=A0 driver: =
cpufreq-dt<br>=C2=A0 CPUs which run at the same hardware frequency: 0 1 2 3=
<br>=C2=A0 CPUs which need to have their frequency coordinated by software:=
 0 1 2 3<br>=C2=A0 maximum transition latency: =C2=A0Cannot determine or is=
 not supported.<br>=C2=A0 hardware limits: 600 MHz - 900 MHz<br>=C2=A0 avai=
lable frequency steps: =C2=A0600 MHz, 700 MHz, 800 MHz, 900 MHz<br>=C2=A0 a=
vailable cpufreq governors: conservative ondemand userspace performance sch=
edutil<br>=C2=A0 current policy: frequency should be within 600 MHz and 900=
 MHz.<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 The=
 governor &quot;schedutil&quot; may decide which speed to use<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 within this range.<br>=
=C2=A0 current CPU frequency: 600 MHz (asserted by call to hardware)<br></d=
iv><div><br></div><div>Looks good...</div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">Le=C2=A0lun. 30 sept. 2024 =C3=A0=
=C2=A022:27, Steffen Nurpmeso &lt;<a href=3D"mailto:steffen@sdaoden.eu">ste=
ffen@sdaoden.eu</a>&gt; a =C3=A9crit=C2=A0:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">Jerome Marc wrote in<br>
=C2=A0&lt;<a href=3D"mailto:CAD1Ag0wW0nw-BR1aqKkD66LLO_yndJAy__i6yg9TWvU_Z6=
QEDA@mail.gmail.com" target=3D"_blank">CAD1Ag0wW0nw-BR1aqKkD66LLO_yndJAy__i=
6yg9TWvU_Z6QEDA@mail.gmail.com</a>&gt;:<br>
=C2=A0|I just installed Alpine 3.20.3 on a RPI 2 in diskless mode.(headless=
,<br>
=C2=A0|minimal installation)<br>
=C2=A0|<br>
=C2=A0|I noticed that if I let the device idling, I have a few seconds late=
ncy<br>
=C2=A0|when I try to connect the machine with SSH for example. Even when co=
nnected<br>
=C2=A0|I can have my SSH session frozen for a few seconds if I do nothing i=
n the<br>
=C2=A0|terminal.<br>
=C2=A0|I notice the same when using a nodejs app (HTTP) therefore this is a=
<br>
=C2=A0|general thing (not just about SSH)<br>
=C2=A0|<br>
=C2=A0|I don&#39;t see anything weird in logs. Any idea ? Is that a power s=
aving<br>
=C2=A0|feature ?<br>
<br>
It *could* be that cpupower-openrc is indeed the<br>
tools/power/cpupower of the linux kernel sources, it seems to be<br>
widely available (architecture-wise, on Alpine).<br>
If that is so, then running it should output stuff like<br>
<br>
=C2=A0 #?0|kent:~# bin/cpupower.sh<br>
=C2=A0 analyzing CPU 0:<br>
=C2=A0 =C2=A0 driver: intel_pstate<br>
=C2=A0 =C2=A0 CPUs which run at the same hardware frequency: 0<br>
=C2=A0 =C2=A0 CPUs which need to have their frequency coordinated by softwa=
re: 0<br>
=C2=A0 =C2=A0 maximum transition latency:=C2=A0 Cannot determine or is not =
supported.<br>
=C2=A0 =C2=A0 hardware limits: 400 MHz - 3.40 GHz<br>
=C2=A0 =C2=A0 available cpufreq governors: performance powersave<br>
=C2=A0 =C2=A0 current policy: frequency should be within 400 MHz and 3.40 G=
Hz.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 The g=
overnor &quot;powersave&quot; may decide which speed to use<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 withi=
n this range.<br>
=C2=A0 =C2=A0 current CPU frequency: Unable to call hardware<br>
=C2=A0 =C2=A0 current CPU frequency: 800 MHz (asserted by call to kernel)<b=
r>
=C2=A0 =C2=A0 boost state support:<br>
=C2=A0 =C2=A0 =C2=A0 Supported: yes<br>
=C2=A0 =C2=A0 =C2=A0 Active: yes<br>
<br>
On the reserve laptop however the EFI(BIOS) &quot;always&quot; sets back<br=
>
cpupower, and we start with &quot;powersave&quot; governor and low<br>
frequency, and so the initial decrypting of the hard disk takes<br>
seeeeconds.=C2=A0 I btw drive it via<br>
<br>
=C2=A0 #!/bin/sh -<br>
=C2=A0 #@ /root/bin/cpupower.sh<br>
=C2=A0 # cpupower is in Linux src, tools/power/cpupower<br>
<br>
=C2=A0 : ${HOSTNAME:=3D$(uname -n)}<br>
<br>
=C2=A0 if [ -f /root/hosts/${HOSTNAME}/cpupower ]; then<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 . /root/hosts/${HOSTNAME}/cpupower<br>
=C2=A0 else<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 logger -s -t /root/bin/cpupower.sh &quot=
;MISS /root/hosts/${HOSTNAME}/cpupower&quot;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit 1<br>
=C2=A0 fi<br>
<br>
=C2=A0 if command -v cpupower &gt;/dev/null 2&gt;&amp;1; then :; else<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 logger -s -t /root/bin/cpupower.sh &#39;=
no cpupower tool&#39;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 exit 1<br>
=C2=A0 fi<br>
<br>
=C2=A0 if [ $# -gt 0 ]; then<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 x=3D<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 case $1 in<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 lo) x=3D$lo;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 med) x=3D$med;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 hi) x=3D$hi;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 default) x=3D$default;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 75) x=3D$x75;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 *) echo &gt;&amp;2 &#39;Synopsis: cpupow=
er [lo|med|hi|default[|75]]&#39;;;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 esac<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [ -n &quot;$x&quot; ] &amp;&amp; cpupowe=
r frequency-set -u $x<br>
=C2=A0 fi<br>
<br>
=C2=A0 cpupower frequency-info<br>
<br>
and that /root/hosts/$HOSTNAME/cpupower is (here)<br>
<br>
=C2=A0 #@ /root/hosts/self/cpupower<br>
=C2=A0 lo=3D&#39;400M -g powersave&#39;<br>
=C2=A0 med=3D&#39;1600M -g powersave&#39;<br>
=C2=A0 hi=3D&#39;3400M -g performance&#39;<br>
=C2=A0 default=3D&#39;3400M -g powersave&#39;<br>
=C2=A0 x75=3D&#39;2500M -g performance&#39;<br>
<br>
(i use &quot;hi&quot; only for kernel and port builds).<br>
It makes &quot;a hell of a difference&quot;.<br>
<br>
Other than that i have seen similar things because (a) the<br>
kernel&#39;s crng came up slowly (up to 30 minutes at times), but this<br>
*should* be a thing of the past (dunno Alpine 3.20, i always use<br>
[edge]), or because of WiFi chip powersafe stuff, i usually do<br>
that though, i use &quot;iw dev $dev set power_save on&quot;:<br>
<br>
=C2=A0 # iw dev wlp1s0 get power_save<br>
=C2=A0 Power save: on<br>
<br>
Other than that i am out of ideas.<br>
<br>
--steffen<br>
|<br>
|Der Kragenbaer,=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 The=
 moon bear,<br>
|der holt sich munter=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0he cheerfully=
 and one by one<br>
|einen nach dem anderen runter=C2=A0 wa.ks himself off<br>
|(By Robert Gernhardt)<br>
</blockquote></div>

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