Added a new post. Minor fixes.

_pages/about.md

@@ -21,7 +21,8 @@ knows what the future will hold us...
 At the moment I am a proud [Parabola GNU/Linux-libre](https://parabola.nu) 
 user running a very lightweight desktop environment like 
 [spectrwm](http://www.spectrwm.org) after going through years of 
-[OpenBox](http://openbox.org)
+[OpenBox](http://openbox.org). I use [Replicant](http://www.replicant.us/) for 
+the mobile phone.
 
 I hope that this turns out to be a useful blog for anyone that encouters 
 similar problems I have solved.

_posts/2017-04-24-qemu-ssh-tunnel.md

@@ -1,6 +1,6 @@
 ---
 title: Qemu SSH tunnel
-updated: 2017-04-24 19:00
+updated: 2017-04-26 20:00
 tags: [qemu, vnc, ssh tunnel]
 description: How to use qemu via VNC and SSH
 ---
@@ -24,8 +24,12 @@ Now, some time ago I've written a
 VirtualBox is not available on Parabola and I don't like the available QEMU 
 frontends.
 
-So, after about 1 hour of information retreival throughout Internet articles I 
-was able to connect all the dots... Here it is.
+So, after about 1 hour of information 
+[retrieval](http://blog.scottlowe.org/2013/08/21/accessing-vnc-consoles-of-kvm-guests-via-ssh/) 
+[throughout](https://www.dragonsreach.it/2012/10/06/ssh-tunneling-for-vnc/)
+[Internet](https://www.cyberciti.biz/faq/linux-kvm-vnc-for-guest-machine/)
+[articles](https://www.cyberciti.biz/faq/howto-setup-vnc-server-ssh-client-tunnel-via-internet/)
+I was able to connect all the dots... Here it is.
 
 ## Premise
 
@@ -160,9 +164,3 @@ attention.
 
 Cheers!
 
-## Resources
-
-- <http://blog.scottlowe.org/2013/08/21/accessing-vnc-consoles-of-kvm-guests-via-ssh/>
-- <https://www.dragonsreach.it/2012/10/06/ssh-tunneling-for-vnc/>
-- <https://www.cyberciti.biz/faq/linux-kvm-vnc-for-guest-machine/>
-- <https://www.cyberciti.biz/faq/howto-setup-vnc-server-ssh-client-tunnel-via-internet/>

_posts/2017-04-25-a-new-fan-for-the-processor.md

@@ -0,0 +1,157 @@
+---
+title: A new fan for the processor
+updated: 2017-04-25 19:00
+tags: [fan, cpu]
+description: 
+---
+
+Hello again,
+
+Some time ago I upgraded the CPU fan because I noticed that the stock one 
+was broken. 
+
+Here's the whole story.
+
+<!--more-->
+
+A couple of years ago I put in a cheap case fan retrieved from a 2003 
+computer just to keep things cooler. The problem of this
+[small fan](https://encrypted.google.com/search?hl=en&q=smaller%20fan%20more%20noise) 
+was the tremendous noise which I couldn't bare anymore.
+
+So, some months ago I decided to open the computer and I was 
+surprised in discovering that the CPU fan wasn't working. Now I had two 
+problems: the noise and one broken fan. I took drastic measures: I pulled out 
+the noisy fan and the broken fan. Then I tested the CPU temperatures using `$ 
+sensors` from the `lm_sensors` package. I found out that the temperatures got 
+up to about 80 °C which is unacceptable for a CPU. I needed to try something 
+else.
+
+I then went into the BIOS options and I heavily undercloked the CPU to obtain 
+temperatures like these (however I don't remember the exact clock values):
+
+```shell
+[parabola@ppc ~]$ sensors
+temp2:        +50.0°C  (high = +80.0°C, hyst = +75.0°C)
+temp3:        +46.5°C  (high = +80.0°C, hyst = +75.0°C)
+Core 0:       +69.0°C  (high = +80.0°C, crit = +100.0°C)
+Core 1:       +63.0°C  (high = +80.0°C, crit = +100.0°C)
+Core 2:       +66.0°C  (high = +80.0°C, crit = +100.0°C)
+Core 3:       +66.0°C  (high = +80.0°C, crit = +100.0°C)
+```
+
+I went on like this for months but, as you can imagine, the computer was a bit 
+slow and laggy especially using Iceweasel.
+
+It was time to buy a new fan and heat sink. So I bought a [Cooler Master Hyper
+212X](https://www.amazon.it/Cooler-Master-Hyper-212X-Ventola/dp/B01ARGVNV6)
+for about 30 euros (which seems to be a very reasonable price). This 
+choice was made because of various factors (in decreasing order of importance):
+
+- The compatibility with my [`LGA 775`](https://en.wikipedia.org/wiki/LGA_775)
+  motherboard
+- The price
+- The reiews
+- Noise information declared
+- Thermal paste included (which saves some euros from shipping)
+
+Once I got the fan the hard part arrived: I had to remove the motherboard from 
+the case to work comfy. This was the first time for me but it well better than 
+I expected, except for a minor irritation at the end.
+
+{% include image.html file="0.jpg" alt="box 0" caption="The fan box" %}
+{% include image.html file="1.jpg" alt="box 1" caption="Technical information 
+reported on the box" %}
+{% include image.html file="2.jpg" alt="box 2" caption="The back of the box" %}
+{% include image.html file="3.jpg" alt="unboxing 0" caption="Unboxing" %}
+{% include image.html file="4.jpg" alt="unboxing 1" %}
+{% include image.html file="5.jpg" alt="unboxing 2" %}
+{% include image.html file="6.jpg" alt="unboxing 3" %}
+{% include image.html file="8.jpg" alt="test 0" caption="Test and comparison 
+with old heatsink before assembly. You may already see a problem here :)" %}
+{% include image.html file="10.jpg" alt="test 1" %}
+{% include image.html file="11.jpg" alt="test 2" %}
+{% include image.html file="12.jpg" alt="test 3" %}
+
+I took some pictures to rember how the cabling should be.
+
+{% include image.html file="13.jpg" alt="cabling 0" %}
+{% include image.html file="14.jpg" alt="cabling 1" %}
+{% include image.html file="15.jpg" alt="cabling 2" %}
+{% include image.html file="16.jpg" alt="cabling 3" %}
+{% include image.html file="17.jpg" alt="cabling 4" %}
+{% include image.html file="18.jpg" alt="cabling 5" %}
+{% include image.html file="19.jpg" alt="cabling 6" %}
+{% include image.html file="21.jpg" alt="motherboard 0" caption="Mother board 
+with the heatsink mounted" %}
+{% include image.html file="22.jpg" alt="motherboard 1" caption="Everything 
+back in place. Ready to test" %}
+{% include image.html file="28.jpg" alt="case 0" caption="Case mods or it won't 
+fit" %}
+{% include image.html file="30.jpg" alt="case 1" %}
+
+I didn't take exact measurements so I knew there was that risk. Since it's an 
+old PC I don't really care about the case. If you have a new PC i suggest you 
+take measurements to see if a potential new internal component fits before you 
+buy it.
+
+At this stage I powered up the computer. The new fan seemed to work fine so I 
+removed the undercloking BIOS settings.
+
+## Use of fancontrol
+
+Finally I configured fancontrol to control automatic throttling of the fan 
+based on the CPU temperature. I used the CLI tool called `pwmconfig` in manual 
+mode otherwise it wouldn't detect the fan. Once the tool finished it generated
+a configuration file and the gnuplot chart below. This chart is not really 
+useful to us because it correlates RPMs with PWMs instead of RPMs and 
+temperature. It just shows how the computer will handle the fan to get it to a 
+certain speed.
+
+{% include image.html file="fan_control_report.png" alt="Fan report" %}
+
+Here is the new `sensors` information
+
+```
+w83627dhg-isa-0290
+Adapter: ISA adapter
+fan2:        1506 RPM  (min = 33750 RPM, div = 8)
+temp1:        +32.0°C  (high = +25.0°C, hyst = +31.0°C)
+temp2:        +34.0°C  (high = +80.0°C, hyst = +75.0°C)
+temp3:        +44.5°C  (high = +80.0°C, hyst = +75.0°C)
+Core 0:       +55.0°C  (high = +80.0°C, crit = +100.0°C)
+Core 1:       +50.0°C  (high = +80.0°C, crit = +100.0°C)
+Core 2:       +52.0°C  (high = +80.0°C, crit = +100.0°C)
+Core 3:       +52.0°C  (high = +80.0°C, crit = +100.0°C)
+```
+
+Much better!
+
+The final thing to do was to add `fancontrol` as a system service.
+
+## Overclocking?
+
+Is it a good idea to overclock now that temperature is not a problem anymore?
+In my case the answer is no.
+
+{% include image.html file="23.jpg" alt="bios setings 0" caption="((2650 / 2333 
+MHz) * 
+100) - 100 = + 13.59% clocking" %}
+
+{% include image.html file="24.jpg" alt="bios settings 1" caption="380 * 7 MHz 
+= 2660 MHz. Maybe too much?" %}
+
+{% include image.html file="26.jpg" alt="bios settings 2" caption="If I don't 
+increase the 
+CPU voltage the BIOS screen won't even come up and the BIOS settings need to 
+be cleared manually" %}
+
+{% include image.html file="27.jpg" alt="kernel panic" caption="Here's what 
+happens" %}
+
+Even at 10% (+10% means 110% of overall clock)
+I had kernel panics sooner or later, although I could see it was faster. This 
+is probably due to the power supply which is not able to stand more electric 
+consumption. So I gave up overclocking. Too bad...
+
+Till next time.