testXX and PPPD 2.4.0-release

testXX and PPPD 2.4.0-release

[Samium Gromoff]

         DESCRIPTION:
     Happen on 2.4.0-testXX, doesnt on 2.2.X
     pppd 2.4.0-b2,b4,release, ppp async in kernel
     Sportster 14400 Vi (if that hell does matter)
      AND! UART 16450!
     I`ve described such a problem to PPP maintainers
   about half-year ago, but got nothing.

     Now it looks like that this problem is /tolerable/
  in 2.4.0-testn; n>7, even when in older tests i was     just a small hell.
    
         PROBLEM ITSELF:
    ~12.5% of small file transfers stalls at beginning,
    when modem lights still flashes and ppp0 interface
    error count significantly grow. it looks like
    data is there, but ppp refuses to take it.
  
    it may look ok, just like some random factor, BUT!
    *this*happens*on*same*files*or*byte*sequences!
    e.g. every one of posted on lkml by Dag Brattli
    irda-posts/mails only downloads by 2.5k, e.g. 
    2 packets... =(
    for another example approx 3 of 25 posts on lkml
    are undownloadable...
    another detail: tcp_ecn=0

    whats the hell?
    
     
     
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Re: testXX and PPPD 2.4.0-release

[Andrew Morton]

Samium Gromoff wrote:
> 
>          DESCRIPTION:
>      Happen on 2.4.0-testXX, doesnt on 2.2.X
>      pppd 2.4.0-b2,b4,release, ppp async in kernel
>      Sportster 14400 Vi (if that hell does matter)
>       AND! UART 16450!
>      I`ve described such a problem to PPP maintainers
>    about half-year ago, but got nothing.
> 
>      Now it looks like that this problem is /tolerable/
>   in 2.4.0-testn; n>7, even when in older tests i was     just a small hell.
> 
>          PROBLEM ITSELF:
>     ~12.5% of small file transfers stalls at beginning,
>     when modem lights still flashes and ppp0 interface
>     error count significantly grow. it looks like
>     data is there, but ppp refuses to take it.

Try disabling PPP compression.  I've observed link failures
when using BSD compression against certain dial access
gateways.

In /etc/ppp/options:

nobsdcomp
deflate 0,0
noaccomp
noccp
nodeflate
nopcomp
nopredictor1
novjccomp
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