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#26 2008-10-17 11:47:40

Theomachos
Member
From: Germany
Registered: 2007-07-31
Posts: 67
Website

Re: Internet does not work after kernel upgrade (quite strange)

Heller_Barde wrote:

good. did you guys tried this TCP_SACK thingie? it worked for me *shrug*

cheers Barde

Yup, seems to work wink

And yes, my router REALLY is crappy lol

Last edited by Theomachos (2008-10-17 11:47:58)


There is one thing even more vital to science than intelligent methods; and that is, the sincere desire to find out the truth, whatever it may be.
Charles S. Peirce

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#27 2008-10-17 14:17:30

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

How do you apply the TCP_SACK thingie?

I can give it a try & see if it works with the upgraded kernel & associated files.

I have a Siemens Speedstream 4200, which doesn't have a great reputation as a modem/router.


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#28 2008-10-17 21:35:26

kiepmad
Member
Registered: 2007-12-26
Posts: 41

Re: Internet does not work after kernel upgrade (quite strange)

I did have the same problems, could not connect to websites with firefox, use thunderbird or instant messaging. Downgrading dhcpcd didn't work, downgrading kernel26 and nvidia to the previous version worked! Trying the fix tomorrow, it's late now. wink

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#29 2008-10-17 23:15:24

Misfit138
Misfit Emeritus
From: USA
Registered: 2006-11-27
Posts: 4,170

Re: Internet does not work after kernel upgrade (quite strange)

handy wrote:

How do you apply the TCP_SACK thingie?

See this post.

BTW the tcp_sack fix does not work for me.

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#30 2008-10-18 07:46:04

Heller_Barde
Member
Registered: 2008-04-01
Posts: 245

Re: Internet does not work after kernel upgrade (quite strange)

Misfit138 wrote:
handy wrote:

How do you apply the TCP_SACK thingie?

See this post.

BTW the tcp_sack fix does not work for me.

damn. that would have been a good workaround to post to the kernel mailing list because it actually points at some specific subsystem...

cheers barde

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#31 2008-10-19 07:15:02

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

I just created an account at Bugzilla, & searched for kernel bugs open on: network, tcp tcpip dhcpcd  & there are none.

I am a Linux kernel distro' beginner, so I have not posted this bug at Bugzilla.

Someone who knows what they are talking about more than I do should be the one to post this bug.

Please could someone spend 10 minutes or so & do it, someone?


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#32 2008-10-19 09:51:28

kiepmad
Member
Registered: 2007-12-26
Posts: 41

Re: Internet does not work after kernel upgrade (quite strange)

Allright, now this is strange.
I applied the patch and most webpages work now, but only most. Anything with an encrypted connection does not load (except my banks website).
Imap is not working. Instant messaging can't connect to server.

I'm downgrading again. tongue

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#33 2008-10-19 13:20:17

Heller_Barde
Member
Registered: 2008-04-01
Posts: 245

Re: Internet does not work after kernel upgrade (quite strange)

kiepmad wrote:

Allright, now this is strange.
I applied the patch and most webpages work now, but only most. Anything with an encrypted connection does not load (except my banks website).
Imap is not working. Instant messaging can't connect to server.

I'm downgrading again. tongue

could you please be a little more specific. which don't load exactly? it's not easy to track down a bug when ppl simply say "it does not work" or "it does work now, somehow"
thank you

cheers Barde

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#34 2008-10-19 14:49:38

opeth115
Member
Registered: 2007-07-19
Posts: 63

Re: Internet does not work after kernel upgrade (quite strange)

Misfit138 wrote:
handy wrote:

How do you apply the TCP_SACK thingie?

See this post.

BTW the tcp_sack fix does not work for me.

the tcp_sack fix didn't work for me either.  I am at a loss of where to find the previous kernel so i can downgrade, as i had recently done a pacman -Scc.  I would, i guess, also need the previous nvidia and dhcpcd, as those seem to be dependent on it?

Last edited by opeth115 (2008-10-19 14:50:15)

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#35 2008-10-19 16:42:42

Erik Xian
Member
Registered: 2008-09-15
Posts: 18

Re: Internet does not work after kernel upgrade (quite strange)

I've been having this problem ever since the latest kernel appeared in the repositories. The only way around it I've found is to downgrade my kernel each time.

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#36 2008-10-19 20:15:10

kiepmad
Member
Registered: 2007-12-26
Posts: 41

Re: Internet does not work after kernel upgrade (quite strange)

Heller_Barde wrote:
kiepmad wrote:

Allright, now this is strange.
I applied the patch and most webpages work now, but only most. Anything with an encrypted connection does not load (except my banks website).
Imap is not working. Instant messaging can't connect to server.

I'm downgrading again. tongue

could you please be a little more specific. which don't load exactly? it's not easy to track down a bug when ppl simply say "it does not work" or "it does work now, somehow"
thank you

cheers Barde

Ok, let's put it this way:
After applying TCP_SACK thingie, every website worked, except EVERY websites with https:// in their URL. However, there is ONE exception which is https://bcee.snet.lu. https//owa.uni.lu, my rootserver's webadmin adress, https://moodle.fstc.uni.lu, amazon.com, amazon.de.
Additionnally connection to an imap web server did not work with or without SSL encrypton.
Additionnally I could not connect to any instant messaging server. I tried MSN and ICQ.

You are VERY welcome.

Cheers kiepmad

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#37 2008-10-20 11:57:07

Heller_Barde
Member
Registered: 2008-04-01
Posts: 245

Re: Internet does not work after kernel upgrade (quite strange)

thank you very much. i will try this out as soon as i get home. i'll file a bug at the main kernel bugtracker, that's why i wanted more information.

cheers Barde

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#38 2008-10-20 12:21:55

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

Heller_Barde wrote:

thank you very much. i will try this out as soon as i get home. i'll file a bug at the main kernel bugtracker, that's why i wanted more information.

cheers Barde

Thanks for doing that.


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#39 2008-10-20 21:38:05

Misfit138
Misfit Emeritus
From: USA
Registered: 2006-11-27
Posts: 4,170

Re: Internet does not work after kernel upgrade (quite strange)

Bug already filed at kernel.org...
But they seem to be focusing on the tcp_sack fix..which doesn't work for some of us.

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#40 2008-10-21 01:08:56

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

I just did an Yaourt -Syu which included a minor kernel update, though I still had the same internet connection problems that we have been experiencing.

Anyway I read the bug report that Misfit138 posted a link to above & after using su I entered the following at the root prompt:

echo 0 > /proc/sys/net/ipv4/tcp_timestamps

I am able to use the current kernel, & my internet problems are no more! big_smile

I have no idea what that command does, but it came up as a worker in the bug report below:

http://bugzilla.kernel.org/show_bug.cgi?id=11721

Last edited by handy (2008-10-21 02:21:31)


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#41 2008-10-21 01:55:55

Misfit138
Misfit Emeritus
From: USA
Registered: 2006-11-27
Posts: 4,170

Re: Internet does not work after kernel upgrade (quite strange)

Great work handy.

Add this to your /etc/sysctl.conf:

#Temporary workaround for tcp issue with 2.6.27
net.ipv4.tcp_timestamps = 0

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#42 2008-10-21 02:20:22

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

Misfit138 wrote:

Great work handy.

Add this to your /etc/sysctl.conf:

#Temporary workaround for tcp issue with 2.6.27
net.ipv4.tcp_timestamps = 0

I wondered whether the above command would be permanent.

Thanks for that info' I'll add it to the new thread:

http://bbs.archlinux.org/viewtopic.php? … 88#p437588


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#43 2008-10-21 22:30:31

Heller_Barde
Member
Registered: 2008-04-01
Posts: 245

Re: Internet does not work after kernel upgrade (quite strange)

thanks everyone. it seems as if the patch is already working and most probably will be in some future version of the kernel so we won't need the fix for ever smile hooray big_smile

cheers Barde

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#44 2008-10-21 23:36:50

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

What patch?


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#45 2008-10-22 19:06:45

gorn
Member
Registered: 2008-02-01
Posts: 56

Re: Internet does not work after kernel upgrade (quite strange)

Another thing to check is tcp_window_scaling. I have a similar issue even with older kernels on funny networks.

http://lwn.net/Articles/92727/

One time fix as root run:
sysctl -w net.ipv4.tcp_window_scaling=0

To make it persistent across reboots:
As root edit /etc/sysctl.conf
Add a line as follows:
net.ipv4.tcp_window_scaling=0

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#46 2008-10-22 20:06:32

JonnyJD
Member
From: Berlin
Registered: 2007-11-05
Posts: 45

Re: Internet does not work after kernel upgrade (quite strange)

handy wrote:

What patch?

http://bugzilla.kernel.org/show_bug.cgi?id=11721#c58 (listed some hours after your post ;-) )

This will be included in 2.6.27.x (with x beeing quite close to 2 i hope)

So either apply the patch or just wait for the next release. I have no time for a long compile so I just wait. Didn't test it myself, but it seems to relate very closely to my problem, referring from the comments and the problem (ordering of tcp options in the packet)

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#47 2008-10-22 21:20:41

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

JonnyJD wrote:
handy wrote:

What patch?

http://bugzilla.kernel.org/show_bug.cgi?id=11721#c58 (listed some hours after your post ;-) )

This will be included in 2.6.27.x (with x beeing quite close to 2 i hope)

So either apply the patch or just wait for the next release. I have no time for a long compile so I just wait. Didn't test it myself, but it seems to relate very closely to my problem, referring from the comments and the problem (ordering of tcp options in the packet)

Thanks for the info'.

As it stands my system is working as well as it ever was, on the current kernel after taking the following actions:

Add this to your /etc/sysctl.conf:

#Temporary workaround for tcp issue with 2.6.27
net.ipv4.tcp_timestamps = 0

So what ill effect does turning off timestamps have on tcp?

Last edited by handy (2008-10-22 21:21:33)


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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#48 2008-10-22 22:52:02

JonnyJD
Member
From: Berlin
Registered: 2007-11-05
Posts: 45

Re: Internet does not work after kernel upgrade (quite strange)

It should not have any impact on your normal use. It can be used to measure round-trip times, I think.

However, it is still a work-around and on the patched kernel it is not necessary to turn it of. I doubt that you will ever see any differences when you just use this option and forget about it.
I think when you have to disable TCP_SACK with your hardware, this can possibly have a small performance impact. Nothing you would care of as a normal user I guess.

I would personally recommend setting on of these options if it helps, rather than patching the kernel, but I just not installing the new kernel for now and waiting for the fixed one is also an option. This is the way I am going, because I don't need the new kernel today. It's just that I will run into problems on arch when I update everything except the kernel, so I need to have a working 2.6.27 kernel somewhen.

Last edited by JonnyJD (2008-10-22 22:53:20)

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#49 2008-10-28 00:29:47

JonnyJD
Member
From: Berlin
Registered: 2007-11-05
Posts: 45

Re: Internet does not work after kernel upgrade (quite strange)

I still need to disable tcp_sack in 2.6.27.4, but the mentioned patch is in the mainline kernel now. Either it is not in .4 yet, or it doesn't work for me.

EDIT:
I can't find the patch in http://www.kernel.org/pub/linux/kernel/ … g-2.6.27.4 so I assume it will be in the next release.

Last edited by JonnyJD (2008-10-28 00:42:58)

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#50 2008-10-28 02:18:33

handy
Member
From: Oz
Registered: 2008-03-26
Posts: 719

Re: Internet does not work after kernel upgrade (quite strange)

Did the following work on your system?

Add this to your /etc/sysctl.conf:

#Temporary workaround for tcp issue with 2.6.27
net.ipv4.tcp_timestamps = 0


I used to be surprised that I was still surprised by my own stupidity, finding it strangely refreshing.
Well, now I don't find it refreshing.
I'm over it!

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