[src/trunk]: src/doc Write known issues on scalability

[ozaki-r <ozaki-r%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/eaa0c4ff3c13
branches:  trunk
changeset: 355690:eaa0c4ff3c13
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Thu Aug 10 09:26:55 2017 +0000

description:
Write known issues on scalability

diffstat:

 doc/TODO.smpnet |  10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diffs (21 lines):

diff -r 24c795c1e37b -r eaa0c4ff3c13 doc/TODO.smpnet
--- a/doc/TODO.smpnet   Thu Aug 10 09:08:54 2017 +0000
+++ b/doc/TODO.smpnet   Thu Aug 10 09:26:55 2017 +0000
@@ -1,4 +1,4 @@
-$NetBSD: TODO.smpnet,v 1.12 2017/08/10 09:08:54 ozaki-r Exp $
+$NetBSD: TODO.smpnet,v 1.13 2017/08/10 09:26:55 ozaki-r Exp $
 
 MP-safe components
 ==================
@@ -145,3 +145,11 @@
 scalability the statistic counters should be per-CPU and we should stop using
 atomic operations for them however we have to remain the counters and atomic
 operations.
+
+Scalability
+-----------
+
+ - Per-CPU rtcaches (used in say IP forwarding) aren't scalable on multiple
+   flows per CPU
+ - ipsec(4) isn't scalable on the number of SA/SP; the cost of a look-up
+   is O(n)