Ubuntu :: Bootup-speed: How Does Dmesg Work?

Jan 26, 2010

REASON: I want to find out how to improve my boot-up and hibernate-awake time for ubuntu (it is 300% slower as hibernate on windows xp on the same machine)

QUESTION: well my question is concerning the tool dmesg. As I understood from reading the quite brief >>man dmesg this tool will show the messages the kernel put out during the boot-up. true? A typical line on my dmesg output I receive would look like this:

Code:
[...]
[ 39.632219] i915 0000:00:02.0: LVDS-1: EDID invalid.
[ 46.964733] wlan0: authenticate with AP 00:23:08:20:58:6f
[ 46.965988] wlan0: authenticated

subquestion:

a) the number in the beginning (is it the time between the two kernel messages?) in the example it wold be about 7 seconds

b) if it is the time in seconds: does it mean the kernel was abusing 7 dseconds for the output of the line? how can I track what causes the delays?

PS: maybe I should post this in a different ubuntuforums subgroup (if so which?) PSS: is there any good webpage (I have not found any yet) on this topic?

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Fedora :: Exactly How Does Dmesg Work?

Jul 21, 2010

I am new here and have only been using Linux for about 3 months so please help by explaining things clearly and don't assume I should know. However, for reasons too detailed to mention here I want to know how dmesg works. What I understand is that it provides log details of the startup, hardware etc until logger takes over. What I want to know is this: Do you still get new log messages in dmesg after boot and after the logger has taken over or is it simply a snapshot of what happens at boot time If you shutdown you machine or more importantly something happens to cause it to crash, does it or is it possible to make it record dmesg logs or is it purly a function of boot up

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May 5, 2010

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Code:
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[code]...

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Code:
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Apr 20, 2011

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The message doesnot appear when I connect to the external ports.

googling pointed me to this [URL]

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Code:
[312682.369635] [UFW BLOCK] IN=eth0 OUT= MAC=00:1e:8c:25:b8:a2:00:14:7f:ff:5d:00:08:00 SRC=58.28.25.10 DST=192.168.1.71 LEN=40 TOS=0x00 PREC=0x00 TTL=60 ID=0 DF PROTO=TCP SPT=80

[Code]...

How can I make dmesg useful to me again?

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Mar 28, 2011

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Surprisingly /var/log/messages doesn't contain those prints! Also I see there is a file named /var/log/dmesg , but that files never gets updated with the prints I see on the screen. So, my question is can I get all those dmesg prints right from the beginning in a file somewhere?

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New one:
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[Code]...

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[Code]...

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Code:
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[code]....

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