Re: TCP performance issues

2000-03-30 Thread John Rousseau
On Mar 29, 2000, Ekkehard Kraemer wrote: > Hallo John, > > JR>I'm thinking that the kernel TCP connection queues are filling up and > JR>further requsts are getting dropped, but at 20? > > Did you check ulimit (file handles)? > > Did you try 'lsof | grep TCP'? Maybe it shows thousands of "

Re: TCP performance issues

2000-03-29 Thread Chris Kakris
John Rousseau wrote: > > I'm doing some performance testing on our server and what I'm seeing > is a little disappointing. > > > > I'm thinking that the kernel TCP connection queues are filling up > and further requsts are getting dropped, but at 20? > > Any ideas on how to debug this would be

TCP performance issues

2000-03-29 Thread John Rousseau
I'm doing some performance testing on our server and what I'm seeing is a little disappointing. We're running JDK1.2.2-RC4 (native threads) on several different machines. I see almost identical behavior running on both of the following machines: quad 200MHz PII, 2GB memory, glibc 2.1.3, kernel

Re: TCP performance issues

2000-03-29 Thread Ekkehard Kraemer
Hallo John, JR>I'm thinking that the kernel TCP connection queues are filling up and JR>further requsts are getting dropped, but at 20? Did you check ulimit (file handles)? Did you try 'lsof | grep TCP'? Maybe it shows thousands of "zombie" TCP/IP connections. Which JDBC driver are you using

Re: TCP performance issues

2000-03-29 Thread John Rousseau
On Thursday Mar 30, 2000, Peter Schuller wrote: > > Our application server starts rejecting TCP connections (actually, > > the OS does, our app never sees these rejected requests) at about 20 > > simultaneous requests. The load average on the system runs a little > > high (5-10) when requests st