Problem solved.
Solution: put the same values for buffers on each machine, for 1GB Ethernet, 32 core & 32G RAM and burst of 200 messages 256kbps this values are enough.
kernel.threads-max = 2048
net.core.optmem_max = 16777216
net.core.rmem_default = 2620280
net.core.rmem_max = 16777216
net.core.wmem_default = 2620280
net.core.wmem_max = 16777216**
I Use a log4j.properties with low cost to performance:
log4j.rootLogger=INFO, default.out
# System.out.println appender for all classes
log4j.appender.default.out=org.apache.log4j.ConsoleAppender
log4j.appender.default.out.threshold=INFO
log4j.appender.default.out.layout=org.apache.log4j.PatternLayout
log4j.appender.default.out.layout.ConversionPattern=%m%n