I have two servers running syslog-ng 2.0.9 on Dell R710's. I did some benchmarking with loggen [1] and was able to generate 41000 msg/sec locally. When I try to forward log messages from one server to the other I only get about 60 msg/sec. tcpdump shows that only that many are sent over the wire as well. I test this by writing to the log file from a script. Any idea what can be the problem? Here are both configs from the sending and receiving servers: ----------- Sending syslog-ng server -------------- options { log_fifo_size(120000); time_reopen (1); time_reap(1); long_hostnames (off); use_dns (no); use_fqdn (no); create_dirs (yes); group(adm); perm(0640); dir_perm(0755); keep_hostname (yes); log_fetch_limit(60000); }; source s_zxtm { file("/var/log/zxtm/access_log",follow_freq(1), flags(no-parse)); }; destination d_logrelay { tcp(somehost.com port(514)); }; log { source(s_zxtm); destination(d_logrelay); flags(flow-control); }; --------------- Receiving syslog-ng server ------------------ options { log_fifo_size(3000000); time_reopen (1); time_reap(1); long_hostnames (off); use_dns (no); use_fqdn (no); create_dirs (yes); group(adm); perm(0640); dir_perm(0755); keep_hostname (yes); stats_freq(600); sync(0); }; source s_zxtm { tcp(max-connections(500), port(514)); }; destination d_zxtm { file("/var/log/zxtm/incoming/$YEAR$MONTH$DAY$HOUR-access_log.aggregated" owner("glassfish") perm(0644) template("$MESSAGE\n") template_escape(no)); }; log { source(s_zxtm); destination(d_zxtm); flags(flow-control); }; -------------- [1]. loggen -iS -r 10000000 -s 200 -I 60 localhost 514 average rate = 41053.50 msg/sec, count=410535