Slow Internet connection under Gentoo (normal under Windows)

kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

Hello!

I have a problem using my home's internet connection. I can connect, get an IP by DHCP, but the speed is awfuly slow (using wired or wireless connection).
The problem is that the speed is "normal" under Windows, but slow under Gentoo.
The speed of my connection is download = 3500 Kbit/s, upload = 300 Kbit/s.
I really don't know from where the problem can come...
The wireless is protected by a filter based on MAC address.

Do you have any idea ?

Thanks a lot!

P.S.: I posted no configuration files, because I really don't know which one could be interesting for this topic. But if some are needed, I'll post them! Thanks!

UberLord · Posted: Fri Aug 31, 2007 9:59 am Post subject:

What's the MTU of the interface?
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kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

The MTU of both interfaces (the wireless and the wired one) are 1500.

UberLord · Posted: Fri Aug 31, 2007 10:12 am Post subject:

Post the output of route -n
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kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

The interface used (eth0) is the wired one.

route -n

UberLord · Posted: Fri Aug 31, 2007 10:49 am Post subject:

OK, I have no more ideas

Sometimes you can get network slowdowns when you have two interfaces on the same subnet with the same metric, but you don't seem to have that.
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kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

Anyway, thanks for your help!

I found a topic similar saying that to correct this problem, I have to disable IPV6.
What do you think about this solution ?
If it sounds good, how can I do it ?

Thanks!!!

mrbig4545 · Tux's lil' helper Joined: 03 Jun 2004 Posts: 124

Yeh that is a good ideda, i had similar problems with a friends kubuntu machine, and disabling ip6 helped loads. Add this line to /ect/modules.d/aliases, that should disable ip6.

kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

I've added this line and rebooted, but it doesn't seem to change a lot.
Do you think that removing all IPV6 support in the kernel and doing a

UberLord · Posted: Sat Sep 01, 2007 1:39 am Post subject:

If you don't actually use ipv6 it sure won't hurt to try!
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kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

I remove the ipv6 use flag from /etc/make.conf and rebuild my kernel without all IPV6 support.
Despite the problem remain... :-(

Any other suggestions?
Anyway, thanks everyone for your help!!

padoor · Advocate Joined: 30 Dec 2005 Posts: 4185 Location: india

how make.conf change can help
i think you have to remake the bzImage with new .config of the kernel without ipv6 support.
i have not altered any selection in default for network and others except for alsa and toshib asupport.
actually my gentoo connection is faster than the windows the connected isp same and intel chip e100 eth0
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sschlueter · Posted: Sat Sep 01, 2007 10:59 pm Post subject:

Do you get any kernel error messages? You could post the output of

freedomeagle1967 · n00b Joined: 26 Aug 2007 Posts: 52 Location: Minnesota

I have a similar problem I have noticed if I am in X using firefox it is awfully slow but on the command line with portage/emerge/rsync and links the speed is very fast I just have not had time yet to troubleshoot do you see a difference between command line and X???
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padoor · Advocate Joined: 30 Dec 2005 Posts: 4185 Location: india

there is no appreciable difference in net speed if X or verbose
the text browser appears to load faster as no images are loaded which take the time.
i usually open 10 windows of opera and 6 windows in firefox
after everything loaded any window is as fasi as other in firefox opera takes a time to connect abt 6 sec
while firefox delays 4 sec to start loading the site
the same sites internet explorer in windows 2000 p start delay is 8 sec firefox even longer in XP pro it is still slower than all these.
i use kde. knemo shows total download speed same both in windows and gentoo in windows i use free netmeter
i feel the packets recieved are processed faster in gentoo than in windows
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kirikou · Tux's lil' helper Joined: 03 Nov 2006 Posts: 83

Thanks! Here is the output of dmesg | tail. I don't see anything interesting in there... :-(

dmesg | tail

nano_o · n00b Joined: 21 Sep 2007 Posts: 2

Hi, I've also got the same problem : everyting is slow on gentoo but normal on windows.
I've removed ipv6 everywhere I could but I've noticed that for dns resolution, two queries are still sent (over ipv4) : one of type A and the other of type AAAA, which times out.
Does anyone know how to eliminate this behaviour (AAAA queries) ?

Thanks

mrbig4545 · Tux's lil' helper Joined: 03 Jun 2004 Posts: 124

Do you have iptables setup, and if so can you post the output of iptables-save

nano_o · n00b Joined: 21 Sep 2007 Posts: 2

I don't have iptables setup, but how could it change something ?

mrbig4545 · Tux's lil' helper Joined: 03 Jun 2004 Posts: 124

Don't know really, it was just a thought, :roll:

xbmodder · Guru Joined: 25 Feb 2004 Posts: 404

Post your entire dmesg
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wrc1944 · Posted: Thu Nov 01, 2007 5:40 pm Post subject:

I guess this is still on topic, but what other network protocols can be turned off, for a simple home desktop ipv4 cable ethernet connection? I've been reading about ipv6 degrading performance on certain systems and conditions for a while now. I guess I'm questioning why we have the ipv6 USE flag enabled by default on a Gentoo installation. I never really thought about it much before now.

I mean, why have all those unneeded modules loaded, even if they don't affect performance? I would assume everything but ipv4 and maybe Unix can be turned off? Is X.25 still in use, and needed? The X.25 Wiki says:

MalleRIM · Guru Joined: 23 Jul 2007 Posts: 563 Location: China

compiling the kernel without ipv6 solved it for me! I'm so glad to have a fast responding FF now. I don't need ipv6 so I'm going to emerge world with USE="-ipv6". But what If I needed it? at least sometimes?

madchaz · Posted: Wed Mar 12, 2008 2:45 pm Post subject:

What's in your /etc/resolve.conf?

Make sure only your router is listed or change to your ISP's dns server.
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Bigun · Advocate Joined: 21 Sep 2003 Posts: 2196

I know this is an old thread but did anyone find a resolution, I'm having the same issue.
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