udev packages showing statistics on startup

Spider.007 · 2008-03-24 11:48:44

I noticed the udev package, after the latest update, prints a 'UDev uevent processing time' and I was wondering why. Although I am a big fan of statistics of any kind , I hope that this is not gonna be a trend where each startup entry is going to add some custom statistics entry to the bootprocess.

Wouldn't it be a better idea to implement this sort of stats globally in the /etc/rc.d/functions replacing the [DONE] entry with something like [DONE in 4.234 s] when some setting has been passed to the kernel or configured in rc.conf, so that there remains some consistency in the boot process?

fwojciec · 2008-03-24 13:06:49

I think this was added because recently devs were trying to cut down the udev processing time -- no idea if this is a permanent feature or not. You should be able to remove it easily by editing /etc/rc.sysinint script if you really don't like it.

neotuli · 2008-03-24 16:33:44

Because that part of the boot process is slow as ass, due to some horrendous scripting.

We just like to remember how slow ass actually is

Spider.007 · 2008-03-24 16:37:39

Hmm, but on my machines udev isn't the slowest part; and if it would be, I wouldn't need a timer to tell me so? I think it makes the boot process a bit cluttered which is why I would like it to be removed; or replaced by a more generic solution

gazj · 2008-03-24 19:22:26

I think it is worth it at least while udev is under active development to be improved, we can all see the improvements as they happen then Which will make us all smile I am sure.

phrakture · 2008-03-24 21:08:05

I added that simply because, in the future, I want people to complain loudly when that number jumps too much. If it takes 3.4 seconds to boot one day, then 7 seconds after an upgrade, I want people to go "oh god someone screwed it up!"

dolby · 2008-03-24 21:12:01

now it got 9500 in compare to the 7000 i had lately btw

Last edited by dolby (2008-03-24 21:12:12)

Martyr · 2008-03-24 21:44:40

Sarcastic overlords rule.

1492, I wanna see someone top that. ;-)

To me, the notice isn't that big of a deal, fsck and init jump out as it is already.

phrakture · 2008-03-24 21:49:23

dolby wrote:

now it got 9500 in compare to the 7000 i had lately btw

See, good numbers to have. I have a feeling this was simply a change between udev 118 and 119.

I am well aware that fsck is a big one, and it will always be as storage size increases (it takes longer to check a bigger disk, duh). But udev should be low, all things considered.

ekerazha · 2008-03-24 22:01:15

About 21000 (21 seconds), I don't see many improvements.

Last edited by ekerazha (2008-03-24 22:02:03)

toofishes · 2008-03-24 23:48:20

udev is definitely the limiting reagent on my machine, since I don't have an fsck that runs every time I boot. Speeding up udev has a noticable impact on my total boot time, so I was glad to accept one more line of boot output in return for some metrics that might help us speed this up.

fwojciec · 2008-03-24 23:55:49

ekerazha wrote:

About 21000 (21 seconds), I don't see many improvements.

There was a thread recently where some people also complained that udev processing time was not improved for them and, as it turned out, the problem was with some custom/old/leftover rules in the /etc/udev/rules.d. Maybe it's worth clearing the directory manually and reinstalling udev package and/or double-checking if any custom rules are not slowing things down.

For reference: my desktop (Athlon X2 4400) takes about 1,5 seconds, my 0.6Ghz Celeron laptop takes 5-6 seconds -- which is a massive improvement over what was the case a while back.

Last edited by fwojciec (2008-03-24 23:57:29)

Alphalutra1 · 2008-03-25 00:09:21

I have been seeing the stats for a little while now, but I was amazed to start seeing i guess after an update, that it went down from 8 seconds to just under 2, so keep up the good work!

Redroar · 2008-03-25 00:37:37

I usually get pretty quick udev times...however I get a weird thing. Sometimes (about 60% of the time), it hangs for a while. Takes upwards of 30 seconds on my A64 3800+. However, if I unplug my USB hardware modem it finishes quickly. If my USB modem isn't plugged in from the start, then it never hangs. If it is plugged in then, yeah, about 60% of the time it hangs. As soon as it is plugged in (even during boot sequence, but after udev) it is recognized in about 1 second, always.

Any ideas? It was always this way, even with the 2007.08 Core ISO. I just unplug it for boot and replug it upon SLiM coming up.

Agh, I feel like a threadjacker. Sorry.

s0lar · 2008-03-25 16:29:46

I saw a huge improvement. I always counted like 20seconds and now it's 9.2 seconds. I am happy.

praka123 · 2008-03-25 18:00:23

for me,it is 4.5 seconds I think that stat is really useful!

ST.x · 2008-03-25 18:14:13

around 1.1 most of the time here.

stylopath · 2008-03-26 15:20:00

I always had a udev processing time between 5 and 6 seconds.

After some updates in testing they went up to 13, so i deleted all udev-rules, downgraded to stable (which means no testing enabled) and reinstalled udev - Back to 5-6 seconds.

Today I installed udev from ABS and compiled it with custom CC-Flags (o3) - and it went down to 3 seconds

I think it won't get much faster on my sempron 3500 Notebook

broch · 2008-03-26 15:57:02

119 is slower than 118 on my laptop (i686) so I went back to 118

Arkane · 2008-03-26 17:36:16

Only a little faster here, something like 4.2s -> 3.8s.

Shaika-Dzari · 2008-03-26 22:04:18

phrakture wrote:

I added that simply because, in the future, I want people to complain loudly when that number jumps too much. If it takes 3.4 seconds to boot one day, then 7 seconds after an upgrade, I want people to go "oh god someone screwed it up!"

Sorry, I could not resist...:lol:

z0phi3l · 2008-03-26 23:04:02

My udev is done in roughly 2322ms

I'm pretty sure that's good

peart · 2008-03-26 23:09:40

Mine varies between approximately 850 and 1050, with a stripped down kernel.

dyscoria · 2008-03-26 23:12:13

Yeah, 1050 for me too with a slightly minimalized custom kernel.

ekerazha · 2008-03-29 12:33:23

fwojciec wrote:

ekerazha wrote:
About 21000 (21 seconds), I don't see many improvements.
There was a thread recently where some people also complained that udev processing time was not improved for them and, as it turned out, the problem was with some custom/old/leftover rules in the /etc/udev/rules.d. Maybe it's worth clearing the directory manually and reinstalling udev package and/or double-checking if any custom rules are not slowing things down.
For reference: my desktop (Athlon X2 4400) takes about 1,5 seconds, my 0.6Ghz Celeron laptop takes 5-6 seconds -- which is a massive improvement over what was the case a while back.

I've tried to clear /etc/udev/rules.d and reinstall udev, but they always are about 21-22 seconds (on a Pentium III 933 Mhz, 512 MB of RAM, Seagate 7200rpm).

On a Turion64 MT-32, 2GB of RAM, 4200rpm they are about 7 seconds.

Last edited by ekerazha (2008-03-29 12:34:15)

Arch Linux

#1 2008-03-24 11:48:44

udev packages showing statistics on startup

#2 2008-03-24 13:06:49

Re: udev packages showing statistics on startup

#3 2008-03-24 16:33:44

Re: udev packages showing statistics on startup

#4 2008-03-24 16:37:39

Re: udev packages showing statistics on startup

#5 2008-03-24 19:22:26

Re: udev packages showing statistics on startup

#6 2008-03-24 21:08:05

Re: udev packages showing statistics on startup

#7 2008-03-24 21:12:01

Re: udev packages showing statistics on startup

#8 2008-03-24 21:44:40

Re: udev packages showing statistics on startup

#9 2008-03-24 21:49:23

Re: udev packages showing statistics on startup

#10 2008-03-24 22:01:15

Re: udev packages showing statistics on startup

#11 2008-03-24 23:48:20

Re: udev packages showing statistics on startup

#12 2008-03-24 23:55:49

Re: udev packages showing statistics on startup

#13 2008-03-25 00:09:21

Re: udev packages showing statistics on startup

#14 2008-03-25 00:37:37

Re: udev packages showing statistics on startup

#15 2008-03-25 16:29:46

Re: udev packages showing statistics on startup

#16 2008-03-25 18:00:23

Re: udev packages showing statistics on startup

#17 2008-03-25 18:14:13

Re: udev packages showing statistics on startup

#18 2008-03-26 15:20:00

Re: udev packages showing statistics on startup

#19 2008-03-26 15:57:02

Re: udev packages showing statistics on startup

#20 2008-03-26 17:36:16

Re: udev packages showing statistics on startup

#21 2008-03-26 22:04:18

Re: udev packages showing statistics on startup

#22 2008-03-26 23:04:02

Re: udev packages showing statistics on startup

#23 2008-03-26 23:09:40

Re: udev packages showing statistics on startup

#24 2008-03-26 23:12:13

Re: udev packages showing statistics on startup

#25 2008-03-29 12:33:23

Re: udev packages showing statistics on startup

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