diff --git a/boards/arm/imx6/sabre-6quad/configs/netknsh/defconfig b/boards/arm/imx6/sabre-6quad/configs/netknsh/defconfig
index 379783e3da2..c74f2af3fe3 100644
--- a/boards/arm/imx6/sabre-6quad/configs/netknsh/defconfig
+++ b/boards/arm/imx6/sabre-6quad/configs/netknsh/defconfig
@@ -35,12 +35,8 @@ CONFIG_BOARD_LOOPSPERMSEC=99369
 CONFIG_BOOT_RUNFROMSDRAM=y
 CONFIG_BUILD_KERNEL=y
 CONFIG_CODECS_HASH_MD5=y
-CONFIG_DEBUG_ASSERTIONS=y
-CONFIG_DEBUG_ERROR=y
-CONFIG_DEBUG_FEATURES=y
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
-CONFIG_DEBUG_WARN=y
 CONFIG_DEV_ZERO=y
 CONFIG_ELF=y
 CONFIG_ELF_STACKSIZE=3072
@@ -66,10 +62,11 @@ CONFIG_INIT_MOUNT_SOURCE=""
 CONFIG_INIT_MOUNT_TARGET="/system"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
+CONFIG_IOB_THROTTLE=16
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_MM_PGALLOC=y
-CONFIG_NDEBUG=y
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
 CONFIG_NETDB_DNSCLIENT_ENTRIES=4
diff --git a/boards/arm/imx6/sabre-6quad/configs/netknsh_smp/defconfig b/boards/arm/imx6/sabre-6quad/configs/netknsh_smp/defconfig
index a11c47f838f..7ba5bcfd85a 100644
--- a/boards/arm/imx6/sabre-6quad/configs/netknsh_smp/defconfig
+++ b/boards/arm/imx6/sabre-6quad/configs/netknsh_smp/defconfig
@@ -35,12 +35,8 @@ CONFIG_BOARD_LOOPSPERMSEC=99369
 CONFIG_BOOT_RUNFROMSDRAM=y
 CONFIG_BUILD_KERNEL=y
 CONFIG_CODECS_HASH_MD5=y
-CONFIG_DEBUG_ASSERTIONS=y
-CONFIG_DEBUG_ERROR=y
-CONFIG_DEBUG_FEATURES=y
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
-CONFIG_DEBUG_WARN=y
 CONFIG_DEV_ZERO=y
 CONFIG_ELF=y
 CONFIG_ELF_STACKSIZE=3072
@@ -66,10 +62,11 @@ CONFIG_INIT_MOUNT_SOURCE=""
 CONFIG_INIT_MOUNT_TARGET="/system"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
+CONFIG_IOB_THROTTLE=16
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_MM_PGALLOC=y
-CONFIG_NDEBUG=y
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
 CONFIG_NETDB_DNSCLIENT_ENTRIES=4
diff --git a/boards/arm/imx6/sabre-6quad/configs/netnsh/defconfig b/boards/arm/imx6/sabre-6quad/configs/netnsh/defconfig
index 949f74df2b8..bbe52d6ab60 100644
--- a/boards/arm/imx6/sabre-6quad/configs/netnsh/defconfig
+++ b/boards/arm/imx6/sabre-6quad/configs/netnsh/defconfig
@@ -5,6 +5,7 @@
 # You can then do "make savedefconfig" to generate a new defconfig file that includes your
 # modifications.
 #
+# CONFIG_NDEBUG is not set
 # CONFIG_NSH_CMDOPT_HEXDUMP is not set
 CONFIG_ADBD_FILE_SERVICE=y
 CONFIG_ADBD_SHELL_SERVICE=y
@@ -30,6 +31,7 @@ CONFIG_BOARD_LOOPSPERMSEC=99369
 CONFIG_BOOT_RUNFROMSDRAM=y
 CONFIG_BUILTIN=y
 CONFIG_CODECS_HASH_MD5=y
+CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEV_ZERO=y
 CONFIG_ELF=y
@@ -46,6 +48,7 @@ CONFIG_FS_HOSTFS=y
 CONFIG_FS_PROCFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_IMX6_ENET=y
 CONFIG_IMX6_UART1=y
 CONFIG_IMX_DDR_SIZE=1073741824
@@ -60,6 +63,8 @@ CONFIG_INIT_MOUNT_SOURCE=""
 CONFIG_INIT_MOUNT_TARGET="/system"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
+CONFIG_IOB_THROTTLE=16
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBUV=y
 CONFIG_LIBUV_THREAD_STACKSIZE=3072
@@ -88,7 +93,6 @@ CONFIG_NET_SKELETON=y
 CONFIG_NET_STATISTICS=y
 CONFIG_NET_TCP=y
 CONFIG_NET_TCPBACKLOG=y
-CONFIG_NET_TCP_WRITE_BUFFERS=y
 CONFIG_NET_UDP=y
 CONFIG_NFS=y
 CONFIG_NSH_ARCHINIT=y
diff --git a/boards/arm/imx6/sabre-6quad/configs/netnsh_smp/defconfig b/boards/arm/imx6/sabre-6quad/configs/netnsh_smp/defconfig
index 7cc8af2e096..4f6d8102de9 100644
--- a/boards/arm/imx6/sabre-6quad/configs/netnsh_smp/defconfig
+++ b/boards/arm/imx6/sabre-6quad/configs/netnsh_smp/defconfig
@@ -37,6 +37,7 @@ CONFIG_EXAMPLES_UDPBLASTER=y
 CONFIG_FS_PROCFS=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
 CONFIG_IMX6_ENET=y
 CONFIG_IMX6_UART1=y
 CONFIG_IMX_DDR_SIZE=1073741824
@@ -44,6 +45,8 @@ CONFIG_IMX_ENET_NTXBUFFERS=1
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_INIT_STACKSIZE=3072
 CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=1514
+CONFIG_IOB_THROTTLE=16
 CONFIG_LIBC_ENVPATH=y
 CONFIG_LIBC_EXECFUNCS=y
 CONFIG_NET=y