Arch Linux

sandstorm

Member

From: Zurich [CH] & Mannheim [DE]

Registered: 2005-08-13

Posts: 171

Why is Linux 3.0 booting so fast?

Just a short explanation: why is Linux 3.0 booting so fast? It almost instantly loads the daemons.

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Martin

freezway

Member

Registered: 2010-06-16

Posts: 15

Re: Why is Linux 3.0 booting so fast?

Hell if I know, mine boots the same speed

sandstorm

Member

From: Zurich [CH] & Mannheim [DE]

Registered: 2005-08-13

Posts: 171

Re: Why is Linux 3.0 booting so fast?

Maybe I need to be more precise. The daemons are loading the same speed. But the time the boot sequenceneeds to reach the daemons is approx. 3 times faster!

ctarwater

Member

Registered: 2009-02-05

Posts: 300

Re: Why is Linux 3.0 booting so fast?

Maybe I need to be more precise. The daemons are loading the same speed. But the time the boot sequenceneeds to reach the daemons is approx. 3 times faster!

I noticed this as well but I didn't take any measurements to prove it 

My laptop running grub w/32 bit Arch (and my wife's) and our media center running Grub2 with 64bit arch all seemed to boot noticeably faster.

ataraxia

Member

From: Pittsburgh

Registered: 2007-05-06

Posts: 1,553

Re: Why is Linux 3.0 booting so fast?

Maybe it's actually the new udev or initscripts rather than the kernel - I bet most of us didn't reboot until the new kernel appeared. In any case, I don't notice a big speedup here, but it was always very fast on my machines.

thesofty

Member

From: Nuremberg, Germany

Registered: 2011-05-09

Posts: 46

Re: Why is Linux 3.0 booting so fast?

Maybe I need to be more precise. The daemons are loading the same speed. But the time the boot sequenceneeds to reach the daemons is approx. 3 times faster!

I upgraded my kernel to 3.0 today, I had the same impression.

Mountainjew

Member

From: Ireland

Registered: 2008-08-24

Posts: 405

Re: Why is Linux 3.0 booting so fast?

Faster here too. I was getting tons of udev messages upon startup for the last few days that i never got before. That seemed to slow things down a lot. But now all that has gone.

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examon

Member

Registered: 2011-05-07

Posts: 208

Re: Why is Linux 3.0 booting so fast?

my laptop is booting exactly the same with 3.0

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jelly

Administrator

From: /dev/null

Registered: 2008-06-10

Posts: 714

Re: Why is Linux 3.0 booting so fast?

Its all thanks to the awesome fixes to the initscripts, thank the arch devs!

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nawitus

Member

Registered: 2009-05-11

Posts: 112

Re: Why is Linux 3.0 booting so fast?

Just measured my boot time, no difference here. Although I already had a quite optimized boot.

pogeymanz

Member

Registered: 2008-03-11

Posts: 1,020

Re: Why is Linux 3.0 booting so fast?

Probably not the kernel. The initscripts are more likely the reason. Unless this  kernel used a different compression or something, which I doubt.

flamelab

Member

From: Athens, Hellas (Greece)

Registered: 2007-12-26

Posts: 2,160

Re: Why is Linux 3.0 booting so fast?

Initscripts for sure.

slytux

Member

From: New York

Registered: 2010-09-25

Posts: 136

Re: Why is Linux 3.0 booting so fast?

The Arch kernel maintainers added a "change-default-console-loglevel.patch" which probably decreases the verbosity of the boot messages displayed.  I have "debug" on my kernel line so I don't notice.

lolilolicon

Member

Registered: 2009-03-05

Posts: 1,722

Re: Why is Linux 3.0 booting so fast?

How measure? Stopwatch, heartbeat or bootchart? Can haz sum pruf?

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sandstorm

Member

From: Zurich [CH] & Mannheim [DE]

Registered: 2005-08-13

Posts: 171

Re: Why is Linux 3.0 booting so fast?

How measure? Stopwatch, heartbeat or bootchart? Can haz sum pruf?

From my side I can only tell I measured by the heartbeat. Could be the initscripts and that the less output created improves the boot sequence. Since I only use the standard Archlinux installation I have a significant improvement. Maybe by eliminating the initscript output. But I was never aware of how fast it can boot!

igndenok

Member

From: Sidoarjo, Indonesia

Registered: 2010-06-07

Posts: 160

Re: Why is Linux 3.0 booting so fast?

Its all thanks to the awesome fixes to the initscripts, thank the arch devs!

Thanks to the Arch devs, I notice speed improvement after reboot using 3.0 for the first time

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Jelle

Member

From: Netherlands

Registered: 2011-01-30

Posts: 84

Re: Why is Linux 3.0 booting so fast?

I noticed the same, but also when booting Gentoo (with the 3.0 kernel). Anyhow, it's very welcome and perhaps I'll do away with e4rat now.

Last edited by Jelle (2011-08-09 07:50:06)

swanson

Member

From: Sweden

Registered: 2011-02-05

Posts: 759

Re: Why is Linux 3.0 booting so fast?

I'm not so sure. My desktop arch stops a tiny bit at "Probing EDD". Is EDD really needed on a desktop machine? Seems it is for bigger disks (8 TB?) or raid? I know that I haven't seen it before and that it is a kernel config parameter. It wasn't activated in 2.6.39 it seems. Anyhow, I put edd=off on my notebook kernel line and it booted a bit faster without problems. I will try it on my desktop as well.

brain0

Developer

From: Aachen - Germany

Registered: 2005-01-03

Posts: 1,382

Re: Why is Linux 3.0 booting so fast?

Add 'loglevel=7' to the kernel command line. I bet it will be slower again.