fanf2 2005/06/29 15:29:05 BST
Modified files:
exim-doc/doc-txt NewStuff
Log:
Add a small note about the performance implications of complicated
ratelimit setups.
Revision Changes Path
1.54 +8 -0 exim/exim-doc/doc-txt/NewStuff
Index: NewStuff
===================================================================
RCS file: /home/cvs/exim/exim-doc/doc-txt/NewStuff,v
retrieving revision 1.53
retrieving revision 1.54
diff -u -u -r1.53 -r1.54
--- NewStuff 27 Jun 2005 14:34:33 -0000 1.53
+++ NewStuff 29 Jun 2005 14:29:05 -0000 1.54
@@ -1,4 +1,4 @@
-$Cambridge: exim/exim-doc/doc-txt/NewStuff,v 1.53 2005/06/27 14:34:33 ph10 Exp $
+$Cambridge: exim/exim-doc/doc-txt/NewStuff,v 1.54 2005/06/29 14:29:05 fanf2 Exp $
New Features in Exim
--------------------
@@ -234,6 +234,14 @@
ratelimit = ${lookup {$sender_host_address} \
cdb {DB/ratelimits.cdb} \
{$value} {RATELIMIT} }
+
+ Warning: if you have a busy server with a lot of ratelimit tests,
+ especially with the per_rcpt option, you may suffer from a performance
+ bottleneck caused by locking on the ratelimit hints database. Apart from
+ making your ACLs less complicated, you can reduce the problem by using a
+ RAM disk for Exim's hints directory, /var/spool/exim/db/. However this
+ means that Exim will lose its hints data after a reboot (including retry
+ hints, the callout cache, and ratelimit data).
TK/01 Added an 'spf' lookup type that will return an SPF result for a given
email address (the key) and an IP address (the database):
