Arch Linux

kclive18

Member

From: Columbus, Ohio, USA

Registered: 2008-05-08

Posts: 219

Figured out problem with stalling websites

I have noticed in many distributions, including Arch, that certain web sites tend to stall, and this is a TCP window scaling problem specific to Linux.  To fix it, run (as root or preceded with "sudo"):

sysctl -w net.ipv4.tcp_window_scaling=0

And it should work.

Source: http://forums.fedoraforum.org/showthread.php?t=127165 (in post #5)

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- Mid-2007 iMac 20", Intel 2GHz Core 2 Duo, 2x1GB DDR2-800, 250GB SATA HDD, and...MIGHTY MOUSE!!! , OSX 10.5 Leopard, ATI Radeon 2400XT 128MB
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zouzou85

Member

From: hopefully some where peaceful

Registered: 2007-12-25

Posts: 29

Re: Figured out problem with stalling websites

Is this a permanent fix? or will we have to run this every boot?

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It's nice to be in a peaceful place like this.

ozar

Member

From: USA

Registered: 2005-02-18

Posts: 1,680

Re: Figured out problem with stalling websites

Is this a permanent fix? or will we have to run this every boot?

I don't know if it really works or not, but you could make it permanent by adding it to /etc/sysctl.conf

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oz

Procyon

Member

Registered: 2008-05-07

Posts: 1,807

Re: Figured out problem with stalling websites

I think I had some sites stalling, but not any I remember or have bookmarked, do you know any?

Also, I presume this can be undone with sysctl -w net.ipv4.tcp_window_scaling=1?

Last edited by Procyon (2008-06-11 18:57:47)

kclive18

Member

From: Columbus, Ohio, USA

Registered: 2008-05-08

Posts: 219

Re: Figured out problem with stalling websites

Yeah, you have to put it in /etc/rc.local for it to happen at boot time.  But it does work.  I have had troubles accessing some parts of my school's website (Ohio State) and resizing the TCP window scaling to 0 fixed the issue.

EDIT: And yes, you can alternatively add it to /etc/sysctl.conf, without the "sysctl -w" of course.

Last edited by kclive18 (2008-06-11 19:45:31)

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My Rigs:
- Mid-2007 iMac 20", Intel 2GHz Core 2 Duo, 2x1GB DDR2-800, 250GB SATA HDD, and...MIGHTY MOUSE!!! , OSX 10.5 Leopard, ATI Radeon 2400XT 128MB
- HP zv6203cl, AMD Athlon 64 3200 S939, 2x512MB DDR400, 80GB 4200rpm HDD, ATI Radeon Xpress 200M 128MB, Arch i686
- 1986 Gibson SG Junior Cherry Red, Ibanez 15W amp, DigiTech RP250 modeling processor

ozar

Member

From: USA

Registered: 2005-02-18

Posts: 1,680

Re: Figured out problem with stalling websites

Here's more info for anyone interested:

http://en.wikipedia.org/wiki/TCP_window_scale_option

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oz