diff --git a/Makefile b/Makefile
index b11e2d5..9aa5e8d 100644
--- a/Makefile
+++ b/Makefile
@@ -1535,3 +1535,10 @@ FORCE:
 # Declare the contents of the .PHONY variable as phony.  We keep that
 # information in a variable so we can use it in if_changed and friends.
 .PHONY: $(PHONY)
+
+# to be called as make myinstall INSTALL_MOD_PATH=`pwd`/dist
+myinstall: modules_install
+	mkdir -p dist
+	cp -a .config dist/config-$(KERNELRELEASE)
+	cp -a arch/x86/boot/bzImage dist/vmlinuz-$(KERNELRELEASE)
+	cp -a System.map dist/System.map-$(KERNELRELEASE)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 98bad1f..758b076 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1274,6 +1274,7 @@ static ssize_t tun_put_user(struct tun_struct *tun,
 			gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 			gso.csum_start = skb_checksum_start_offset(skb);
 			gso.csum_offset = skb->csum_offset;
+			printk(KERN_INFO "tun csum_start=%i csum_offset=%i headroom=%i\n", gso.csum_start, gso.csum_offset, skb_headroom(skb));
 		} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
 			gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;
 		} /* else everything is zero */
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7d9f84a..f9afdda 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -824,6 +824,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
 		hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 		hdr->hdr.csum_start = skb_checksum_start_offset(skb);
 		hdr->hdr.csum_offset = skb->csum_offset;
+		printk(KERN_INFO "virtio-net csum_start=%i csum_offset=%i\n", hdr->hdr.csum_start, hdr->hdr.csum_offset);
 	} else {
 		hdr->hdr.flags = 0;
 		hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
diff --git a/net/core/dev.c b/net/core/dev.c
index 30eedf6..3d878e5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2266,6 +2266,7 @@ int skb_checksum_help(struct sk_buff *skb)
 	}
 
 	offset = skb_checksum_start_offset(skb);
+	printk(KERN_INFO "skb_checksum_help csum_start=%i csum_offset=%i headroom=%i partial=%i\n", offset, skb->csum_offset, skb_headroom(skb), (skb->ip_summed == CHECKSUM_PARTIAL));
 	BUG_ON(offset >= skb_headlen(skb));
 	csum = skb_checksum(skb, offset, skb->len - offset, 0);
 
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c1a3303..0d90e3c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2205,6 +2205,8 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
 		csstart = skb_checksum_start_offset(skb);
 	else
 		csstart = skb_headlen(skb);
+	
+	printk(KERN_INFO "skbuff csum_start=%li partial:%i headroom:%i\n", csstart, (skb->ip_summed == CHECKSUM_PARTIAL), skb_headroom(skb));
 
 	BUG_ON(csstart > skb_headlen(skb));
 
@@ -2217,6 +2219,7 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
 		long csstuff = csstart + skb->csum_offset;
+		printk(KERN_INFO "skbuff csum_offset=%i\n", skb->csum_offset);
 
 		*((__sum16 *)(to + csstuff)) = csum_fold(csum);
 	}