On 01/07/11 19:24, Wietse Venema wrote:
The fix is for the client to append<CR><LF>.<CR>LF> to the message
content before writing it to the network.
The workaround is for the client to turn off Nagle delays.
Thanks. That was it for sure.
Just for the benefit of others:
- it was hard for me to change the php client library, although I have
posted a bug for Swift Mailer
http://swiftmailer.lighthouseapp.com/projects/21527-swift-mailer/tickets/204-nagle-delays-affect-mail-sending-throughput
- it was also hard to change the client to turn off Nagle delays,
because Swift Mailer is using the wrong php library to allow that.
So I changed the system wide Nagle behaviour on the server, which is a
freebsd system.
http://lists.freebsd.org/pipermail/freebsd-stable/2008-June/043325.html
sysctl net.inet.tcp.delacktime=10
# (default 100ms)
Which reduced 90% of the delay.
Not ideal, but fine in this case, since most of the traffic to that
hosts is LAN or very high speed WAN.
Thanks again.
--
Oliver Schonrock
