Messages in this thread | | | Date | Mon, 7 Mar 2005 14:19:57 +0000 | From | Ralf Baechle <> | Subject | Re: ax25 t1_timeout |
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On Sun, Mar 06, 2005 at 11:58:11AM +0200, jarmo wrote:
> Withs kernel 2.6.11 ax25 t1_timeout is working badly... > Expl. I have set t1_timeout to 10s (10000).Now testing.. > Taking radio of,set connection to somewhere,first try then > 10s time second try...But then 20s and try next 30s and try... > So t1_timeout is increasing?In 2.6.10 timeout is 10 and > it does not increase...Possible bug?
No, pilot error ;-)
Linux supports three different backoff types which can be configured via /proc or sysctl. This is how to display the backoff type of interface sp0, for example:
[root@dl5rb] sysctl net.ax25.sp0.backoff_type net.ax25.sp0.backoff_type = 1 [root@dl5rb]
1 in this example stands for linear backoff which is the default and what you've been observing. 0 would be no backoff which generally in a shared RF environment is probably unfriendly and can mathematically be shown to cause network meltdowns. Finally 2 would means exponential backoff, which would use t1, 2*t1, 4*t1, 8*t1 for the waiting time, but never goes worse than 8 * t1.
You can change the value with sysctl also but generally linear backoff is quite reasonable.
73 de DL5RB op Ralf
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