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From Deepak Shetty <>
Subject Re: localhost kernel: possible SYN flooding on port 80. Sending cookies
Date Fri, 12 Mar 2010 22:28:37 GMT
1. Do you have assertions on your test that verify your response? JMeter
will only flag HTTP errors. It cant flag application errors unless you have
assertions. Or you might temporarily run in GUI mode with a view results
tree or use a simple listener to write out the response data and inspect
what you are getting
Can you run for lower loads and see what happens
2. It llooks like your server may be blocking these many concurrent requests
, probably you have something configured for a denial of service? Ask your
*nix administrators". I see Google returns a lot of results in this area so
you might want to go through those

On Fri, Mar 12, 2010 at 1:37 PM, William Ottley <>wrote:

> Ok, i'm trying to figure out if i'm really doing things right or not.
> I did a test, where there are 2 jmeter instances (no listening port):
> JVM_ARGS="-Xms256m -Xmx256m" ./jmeter -n -t inst2.jmx -l jmeter_2.log
> and the test uses 2 thread groups, with 1500 threads and 4 loops.
> I look at all the log files,and they come out with:
> <httpSample t="1" lt="1" ts="1268429237964" s="true" lb="EU2 - page get #2"
> rc="200" rm="OK" tn="End User 2 2-1443" dt="text" by="2994"/>
> I get no errors! yet i'm used to seeing those java errors indicating that
> its either out of memory, or can't create a thread.
> I do a small script that grabs (what I thought were threads): netstat
> -anp|grep :81|wc -l
> and i get somewhere between 15,000 and 17,000 in "number",
> I go to the mod-status, and look at what it says: 5 requests currently
> being
> processed, 49 idle workers
> where the max i see is 10 to 35...
> but i get a lot of these in /var/log/messages:
> localhost kernel: possible SYN flooding on port 80. Sending cookies
> is the kernel stopping the treads from reaching the apache server???
> shouldn't i see like: 3,000 requests currently being processed, 49 idle
> workers???
> any help would be appreciated in this!

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