Two-phase queue run perf: parallel processes for phase one

[users/jgh/exim.git] / doc / doc-txt / ChangeLog

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 1b38268b4be30aceea280be3e59d4b2d4eb7dd60..3b160cb86011b15390a6bbbb7218f068bcba3d6e 100644 (file)
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -109,6 +109,12 @@ PP/01 Update the openssl_options possible values through OpenSSL 1.1.1c.
       allow_no_dhe_kex, cryptopro_tlsext_bug, enable_middlebox_compat,
       no_anti_replay, no_encrypt_then_mac, prioritize_chacha, tlsext_padding
 
+JH/23 Performance improvement in the initial phase of a two-pass queue run.  By
+      running a limited number of proceses in parallel, a benefit is gained. The
+      amount varies with the platform hardware and load.  The use of the option
+      queue_run_in_order means we cannot do this, as ordering becomes
+      indeterminate.
+
 
 Exim version 4.93
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