Hi All
During some performance tests, we've seen that Tomcat resets TCP
connections under high load. To reproduce this rather consistently, a
thread pool with a maximum of 300 threads could be configured on default
Tomcat 6.0.32, and then 1280 ~ 2560 concurrent user requests simulated
from a different machine over a real NW interface. I assume this could
be reproduced with proportionately smaller numbers for both as well. The
implementation uses a Xfire soap service.
Tomcat refusing connections, or taking longer to accept new connections,
or taking longer to reply (causing a socket timeout) can be expected
under such load - but what we see are TCP resets of connections to which
a client has already sent a full HTTP request.
Is this the default behavior of Tomcat? The problem this presents is
that the client cannot safely fail over to another instance, unlike with
a refused connection or a connect timeout (i.e. delay in accepting)
thanks
asankha
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
--
Asankha C. Perera
AdroitLogic, http://adroitlogic.org
http://esbmagic.blogspot.com
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