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Mention the limitation of enabling both NET_MPSAFE and ALTQ

This commit is contained in:
ozaki-r 2017-12-05 03:23:29 +00:00
parent 604ff9ba7a
commit 21a3f65ab7
1 changed files with 10 additions and 1 deletions
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11
doc/TODO.smpnet
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@ -1,4 +1,4 @@
$NetBSD: TODO.smpnet,v 1.17 2017/11/20 09:01:20 ozaki-r Exp $
$NetBSD: TODO.smpnet,v 1.18 2017/12/05 03:23:29 ozaki-r Exp $
MP-safe components
==================
@ -173,3 +173,12 @@ ec_multiaddrs must be protected by ec_lock. The core of ethernet subsystem is
already MP-safe, however, device drivers that use the data should also be fixed.
A typical change should be to protect manipulations of the data via ETHER_*
macros such as ETHER_FIRST_MULTI by ETHER_LOCK and ETHER_UNLOCK.
ALTQ
----
If ALTQ is enabled in the kernel, it enforces to use just one Tx queue (if_snd)
for packet transmissions, resulting in serializing all Tx packet processing on
the queue. We should probably design and implement an alternative queuing
mechanism that deals with multi-core systems at the first place, not making the
existing ALTQ MP-safe because it's just annoying.