how to check for TCP_VEGAS on AR670W w/ build 13069?

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Greatwolf
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Joined: 16 Oct 2009
Posts: 8
PostPosted: Mon Dec 07, 2009 0:20    Post subject: how to check for TCP_VEGAS on AR670W w/ build 13069? Reply with quote
how can I check if tcp_vegas is currently enabled and being used? Is there any way to check the status and effect that tcp_vegas has on the connections?

I checked the path:

Code:
/proc/sys/net/ipv4


but none of these files exist there:

Code:
tcp_westwood
tcp_vegas_cong_avoid
tcp_vegas_alpha
tcp_vegas_beta


Thanks
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DougWare
DD-WRT Novice


Joined: 26 Sep 2007
Posts: 31
PostPosted: Mon Dec 07, 2009 8:11    Post subject: Reply with quote
I had this question a couple of months ago and even opened a bug on the issue.

Since then, I believe I've found the answer on my own.


It appears that vegas is set using:
/proc/sys/net/ipv4/tcp_congestion_control

I used these commands from SSH to view the congestion control mode:
Code:

cat /proc/sys/net/ipv4/tcp_available_congestion_control
vegas westwood reno bic cubic highspeed hybla htcp scalable
cat /proc/sys/net/ipv4/tcp_congestion_control
vegas


Hope this helps...
Doug
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Greatwolf
DD-WRT Novice


Joined: 16 Oct 2009
Posts: 8
PostPosted: Mon Dec 07, 2009 8:19    Post subject: Reply with quote
thanks for the response but the other thing I'm wondering about is how do I know what values are being used for alpha, beta and gamma since these files don't exist in said path?

I have the following saved in the commands->firewall section:

Code:
echo 0 > /proc/sys/net/ipv4/tcp_westwood
echo 1 > /proc/sys/net/ipv4/tcp_vegas_cong_avoid
echo 2 > /proc/sys/net/ipv4/tcp_vegas_alpha
echo 6 > /proc/sys/net/ipv4/tcp_vegas_beta
echo 2 > /proc/sys/net/ipv4/tcp_vegas_gamma


but is there a way to verify that these values are being used?

Thanks
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DougWare
DD-WRT Novice


Joined: 26 Sep 2007
Posts: 31
PostPosted: Wed Dec 09, 2009 18:10    Post subject: Reply with quote
I can't answer that, but those commands do not work.

I've opened a bug on this weeks ago, the link is listed below. Perhaps you can create/login using a bugtracker account and comment that you are seeing the same issue.

http://www.dd-wrt.com/dd-wrtv2/bugtracker/view.php?id=3748

Doug

Greatwolf wrote:
thanks for the response but the other thing I'm wondering about is how do I know what values are being used for alpha, beta and gamma since these files don't exist in said path?

I have the following saved in the commands->firewall section:

Code:
echo 0 > /proc/sys/net/ipv4/tcp_westwood
echo 1 > /proc/sys/net/ipv4/tcp_vegas_cong_avoid
echo 2 > /proc/sys/net/ipv4/tcp_vegas_alpha
echo 6 > /proc/sys/net/ipv4/tcp_vegas_beta
echo 2 > /proc/sys/net/ipv4/tcp_vegas_gamma


but is there a way to verify that these values are being used?

Thanks
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