Patchwork [v2,3/4] mac802154: Increase tx_buffer_len

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Submitter Alan Ott
Date April 3, 2013, 2 p.m.
Message ID <1364997658-16498-4-git-send-email-alan@signal11.us>
Download mbox | patch
Permalink /patch/233492/
State Accepted
Delegated to: David Miller
Headers show

Comments

Alan Ott - April 3, 2013, 2 p.m.
Increase the buffer length from 10 to 300 packets. Consider that traffic on
mac802154 devices will often be 6LoWPAN, and a full-length (1280 octet)
IPv6 packet will fragment into 15 6LoWPAN fragments (because the MTU of
IEEE 802.15.4 is 127).  A 300-packet queue is really 20 full-length IPv6
packets.

With a queue length of 10, an entire IPv6 packet was unable to get queued
at one time, causing fragments to be dropped, and making reassembly
impossible.

Signed-off-by: Alan Ott <alan@signal11.us>
---
 net/mac802154/wpan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index 7d3f659..2ca2f4d 100644
--- a/net/mac802154/wpan.c
+++ b/net/mac802154/wpan.c
@@ -360,7 +360,7 @@  void mac802154_wpan_setup(struct net_device *dev)
 	dev->header_ops		= &mac802154_header_ops;
 	dev->needed_tailroom	= 2; /* FCS */
 	dev->mtu		= IEEE802154_MTU;
-	dev->tx_queue_len	= 10;
+	dev->tx_queue_len	= 300;
 	dev->type		= ARPHRD_IEEE802154;
 	dev->flags		= IFF_NOARP | IFF_BROADCAST;
 	dev->watchdog_timeo	= 0;