Re: Re: large amount of R in server-status

[Hendrik Schmieder <hendrik.schmieder@xxxxxxxxx>]

Dietmar Müller schrieb:
> >  Hi,
> >
> >  I use since long time the apache in version 2.0 on windows 2000 (SP4).
> >  Since 4 weeks I can see (some times per day) many R in server-status.
> >  Sometimes so much that the server run full and stop working because all
>
> >  threads are used. I search in web and generally the response is that it have
> >  to do with dos but I'm not sure (or can't believe that)
> >
> >  When I watch over some time the serverstatus I can see sometimes requests
>
> >  staying in R status until the configparameter timeout=300 (default) kick the
> >  request out. Sometimes this R staying requests use more then 50% from my
> >  reads and then after timeout all works like expexcted. Sometimes the
>
> >  complete webserver is blocked.
> >
> >  Current I have 450 threads on apache and in background 2 clustered tomcats
> >  with a 200 threads.
> >
> >  Can anybody explain me how it is possible that some (?) can send a rq to a
>
> >  webserver and don't finish the rq that the server wait for it? How can I
> >  solve such situations?
> >
> >  Further: how can I identify and/or analyze a problem like this. I have now a
> >  situation where I have log the network trafik with wireshark.
>
> >  This problem start (about) at a time when we switch to a new provider.
> >
> >  I have now version 2.0.57 but I have the problem also in the latest version
> >  from the 2.0 tree.
> >
> >  If someone has some hint and or experience how to identify the problem -->
>
> >  thanks for any comment / hint
> >
> >  regards Dietmar
>
> Hi,
> I found the problem :-)
>
> http://ha.ckers.org/slowloris
>
> /* for the archive */
> to isolate the problem I write a small script which store every sec netstat -na
>
> and the after analyze it and search some hours in web I found the problem.
>
> Might after migration to an other os follow mod is a solution:
> http://mod-qos.sourceforge.net/
>
>
> hope this help other people!
>
> If someone have any input about this pls let me know
>
> regards Dietmar

And what is the root of your problem ?

regards

  Hendrik


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