Hi Peter / Chris My sincere apologies, as I somehow missed this original reply from Peter :(
Operating system and version? > Java version? > ubuntu@ip-10-202-99-31:~/configs$ uname -a Linux ip-10-202-99-31 2.6.35-24-virtual #42-Ubuntu SMP Thu Dec 2 05:15:26 UTC 2010 x86_64 GNU/Linux ubuntu@ip-10-202-99-31:~/configs$ java -version java version "1.6.0_25" Java(TM) SE Runtime Environment (build 1.6.0_25-b06) Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode) > Tomcat version: 6.0.32 - thanks for this. > Java or native connector? > I believe Java - its the default Zip installation extracted. With just the thread pool enabled on 8080 connector, with 300 threads. > Pure Tomcat or something else in front? (I'm assuming pure Tomcat from > what else you say) > Nothing in front I guess the tcodump holds the key to seeing this happen. Note that this all hapens within just one second. The load was through an ESB that uses NIO - and I believe this really pushes data on all sockets at the same time. > No. Time Source Destination Protocol > > Src Port Dst Port Info > > 389961 37.056567 10.77.69.8 10.101.29.42 TCP > > 9062 8080 9062 > 8080 [SYN] Seq=0 Win=5792 [TCP CHECKSUM > INCORRECT] > > Len=0 MSS=1460 TSV=363753 TSER=363574 WS=7 > > 391297 37.108766 10.101.29.42 10.77.69.8 TCP > > 8080 9062 8080 > 9062 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 > > MSS=1460 TSV=363383 TSER=363753 WS=7 > > 391298 37.108773 10.77.69.8 10.101.29.42 TCP > > 9062 8080 9062 > 8080 [ACK] Seq=1 Ack=1 Win=5888 [TCP CHECKSUM > > INCORRECT] Len=0 TSV=363758 TSER=363383 > > 391893 37.115809 10.77.69.8 10.101.29.42 HTTP > > 9062 8080 POST /xfire/xfire-service HTTP/1.1 > > 391894 37.115837 10.77.69.8 10.101.29.42 HTTP > > 9062 8080 Continuation or non-HTTP traffic[Packet size limited > > during capture] > > 392677 37.125492 10.101.29.42 10.77.69.8 TCP > > 8080 9062 8080 > 9062 [RST] Seq=1 Win=0 Len=0 > I'll be happy to share any more information as required. thanks asankha
