chroot: import modprobe.d/no-copybreak.conf from vyatta-cfg-system

data/live-build-config/includes.chroot/etc/modprobe.d/no-copybreak.conf

@@ -0,0 +1,60 @@
+#
+# **** License ****
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# This code was originally developed by Vyatta, Inc.
+# Portions created by Vyatta are Copyright (C) 2009 Vyatta, Inc.
+# All Rights Reserved.
+# **** End License ****
+#
+# Author:  Bob Gilligan <gilligan@vyatta.com>
+#
+# Some network interface drivers employ a scheme known as "copybreak"
+# in which they make a copy of a received skb if the size of the
+# buffer is below a particular threshold, then return the original
+# receive skb back to the pool.  Since these drivers initially
+# allocate a buffer size that is larger than the largest possible
+# packet, this scheme returns that large buffer to the pool quickly,
+# and uses a smaller one.
+#
+# The primary benefit of copybreak is better memory utilization.  On
+# systems where the data is ultimately going to be copied out to user
+# space, the copybreak scheme is "low cost" because it has the side
+# benefit of priming the cache for that later copy.  But on a router
+# that only touches the header fields of a received packet, the cost
+# can be relatively higher.  And on modern systems the memory savings
+# is rarely an important consideration.
+#
+# Some of the drivers that employ copybreak make the feature
+# configurable via a module parameter.  This file disables copybreak
+# in some of those drivers.  Generally this results in an improvement
+# in forwarding performance for traffic using these drivers.
+
+options 3c515 rx_copybreak=0
+options 3c59x rx_copybreak=0
+options bcm63xx copybreak=0
+options cxgb copybreak=0
+options e1000 copybreak=0
+options e1000e copybreak=0
+options epic100 rx_copybreak=0
+options fealnx rx_copybreak=0
+options hamachi rx_copybreak=0
+options ixgb copybreak=0
+options natsemi rx_copybreak=0
+options pch_gbe copybreak=0
+options pcnet32 rx_copybreak=0
+options sis190 rx_copybreak=0
+options sky2 copybreak=0
+options starfire rx_copybreak=0
+options sundance rx_copybreak=0
+options typhoon rx_copybreak=0
+options via-rhine rx_copybreak=0
+options via-velocity rx_copybreak=0
+options yellowfin rx_copybreak=0