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From William Ottley <williamott...@gmail.com>
Subject localhost kernel: possible SYN flooding on port 80. Sending cookies
Date Fri, 12 Mar 2010 21:37:33 GMT
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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