[Buildroot] [PATCH] dhcp: add config option for delayed-ack feature of dhcp server

This patch creates a config option for the ISC DHCP server to allow passing
--enable-delayed-ack to its configure script.

Signed-off-by: Thomas De Schampheleire <redacted>

---
 package/dhcp/Config.in |  5 +++++
 package/dhcp/dhcp.mk   |  4 ++++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/package/dhcp/Config.in b/package/dhcp/Config.in
--- a/package/dhcp/Config.in
+++ b/package/dhcp/Config.in

@@ -13,6 +13,11 @@ config BR2_PACKAGE_DHCP_SERVER
 	help
 	  DHCP server from the ISC DHCP distribution.
 
+config BR2_PACKAGE_DHCP_SERVER_DELAYED_ACK
+	bool "Enable delayed ACK feature"
+	depends on BR2_PACKAGE_DHCP_SERVER
+	help
+	  Enable delayed ACK feature in the ISC DHCP server.
 
 config BR2_PACKAGE_DHCP_RELAY
 	bool "dhcp relay"

diff --git a/package/dhcp/dhcp.mk b/package/dhcp/dhcp.mk
--- a/package/dhcp/dhcp.mk
+++ b/package/dhcp/dhcp.mk

@@ -17,6 +17,10 @@ DHCP_CONF_OPT = \
 	--with-cli-pid-file=/var/run/dhclient.pid \
 	--with-relay-pid-file=/var/run/dhcrelay.pid
 
+ifeq ($(BR2_PACKAGE_DHCP_SERVER_DELAYED_ACK),y)
+        DHCP_CONF_OPT += --enable-delayed-ack
+endif
+
 ifneq ($(BR2_INET_IPV6),y)
         DHCP_CONF_OPT += --disable-dhcpv6
 endif

On 07/19/2013 09:46 AM, Thomas De Schampheleire wrote:

Can't you just enable it to avoid config cluttering?
AFAIK it's not a default-on option in dhcpd.conf
Regards.

Hi Gustavo,

On Fri, Jul 19, 2013 at 3:15 PM, Gustavo Zacarias
[off-list ref] wrote:

On 07/19/2013 09:46 AM, Thomas De Schampheleire wrote:

quoted

+config BR2_PACKAGE_DHCP_SERVER_DELAYED_ACK
+     bool "Enable delayed ACK feature"
+     depends on BR2_PACKAGE_DHCP_SERVER
+     help
+       Enable delayed ACK feature in the ISC DHCP server.

Can't you just enable it to avoid config cluttering?
AFAIK it's not a default-on option in dhcpd.conf

Maybe, I'm not an expert on the matter. The RELNOTES file says the
following for 4.1.0a2:
 "Delayed-ack is now a compile-time option, compiled out by default.
  This feature is simply too experimental for right now, and causes
  some problems to some failover installations.  We will revisit this
  in future releases."

and also the man page:
"Please note that as delayed-ack is currently experimental, the delayed-ack
feature is not compiled in by default, but must be enabled at compile time
with \'./configure --enable-delayed-ack\'."

but in the meantime we're several releases further. I don't know if it
is still accurate.

I think you're right that it's not default-on in dhcpd.conf.

What do you say, enable it always at compile time?

Thanks,
Thomas

On 07/19/2013 10:32 AM, Thomas De Schampheleire wrote:

but in the meantime we're several releases further. I don't know if it
is still accurate.

I think you're right that it's not default-on in dhcpd.conf.

What do you say, enable it always at compile time?

Oh yes it's a default, so let's just keep the option.
(includes/dhcpd.h -> DEFAULT_DELAYED_ACK)
I hate build options :)
Regards.

On Fri, Jul 19, 2013 at 3:43 PM, Gustavo Zacarias
[off-list ref] wrote:

On 07/19/2013 10:32 AM, Thomas De Schampheleire wrote:

quoted

but in the meantime we're several releases further. I don't know if it
is still accurate.

I think you're right that it's not default-on in dhcpd.conf.

What do you say, enable it always at compile time?

Oh yes it's a default, so let's just keep the option.
(includes/dhcpd.h -> DEFAULT_DELAYED_ACK)

You're right, so we have to keep the option.
Hence, the patch remains as it is.

Thanks for your feedback,
Thomas

quoted

quoted

quoted

quoted

"Thomas" == Thomas De Schampheleire [off-list ref] writes:

 Thomas> This patch creates a config option for the ISC DHCP server to
 Thomas> allow passing --enable-delayed-ack to its configure script.

Committed, thanks.

Are you really building such a big system with Buildroot that the fsyncs
matter?

-- 
Bye, Peter Korsgaard