Date: Tue, 23 Oct 2012 18:37:00 +0200 From: Andre Oppermann <oppermann@networx.ch> To: freebsd-current@freebsd.org Subject: ZERO_COPY_SOCKETS kernel option removed Message-ID: <5086C7AC.5050009@networx.ch> In-Reply-To: <201210231633.q9NGXhIX010297@svn.freebsd.org> References: <201210231633.q9NGXhIX010297@svn.freebsd.org>
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The ZERO_COPY_SOCKETS kernel option has been removed from HEAD
today. Please see the explanation in the attached commit message.
--
Andre
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Message-Id: <201210231633.q9NGXhIX010297@svn.freebsd.org>
From: Andre Oppermann <andre@FreeBSD.org>
Date: Tue, 23 Oct 2012 16:33:43 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
svn-src-head@freebsd.org
Subject: svn commit: r241955 - head
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Author: andre
Date: Tue Oct 23 16:33:43 2012
New Revision: 241955
URL: http://svn.freebsd.org/changeset/base/241955
Log:
Note the removal of the ZERO_COPY_SOCKETS kernel option in r241931
and provide a proper explanation.
Modified:
head/UPDATING
Modified: head/UPDATING
==============================================================================
--- head/UPDATING Tue Oct 23 16:12:17 2012 (r241954)
+++ head/UPDATING Tue Oct 23 16:33:43 2012 (r241955)
@@ -25,6 +25,17 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 10
"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
20121023:
+ The ZERO_COPY_SOCKET kernel option has been removed and
+ split into SOCKET_SEND_COW and SOCKET_RECV_PFLIP.
+ NB: SOCKET_SEND_COW uses the VM page based copy-on-write
+ mechanism which is not safe and may result in kernel crashes.
+ NB: The SOCKET_RECV_PFLIP mechanism is useless as no current
+ driver supports disposeable external page sized mbuf storage.
+ Proper replacements for both zero-copy mechanisms are under
+ consideration and will eventually lead to complete removal
+ of the two kernel options.
+
+20121023:
The IPv4 network stack has been converted to network byte
order. The following modules need to be recompiled together
with kernel: carp(4), divert(4), gif(4), siftr(4), gre(4),
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