From: t_jeang <devnull@localhost>
Date: Tue, 6 Jan 2009 12:06:02 +0000 (+0000)
Subject: [NETBACK] Try to pull a minimum of 72 bytes into the skb data area
X-Git-Tag: netback-handle-small-tso-with-no-segmentation
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=4f8166809cf7cc93b04f850cde44da4dcf454121;p=xenclient%2Fkernel.git

[NETBACK] Try to pull a minimum of 72 bytes into the skb data area
when receiving a packet into netback.  The previous number, 64, tended
to place a fragment boundary in the middle of the TCP header options
and led to unnecessary fragmentation in Windows <-> Windows
networking.

Signed-off-by: Steven Smith <ssmith@xensource.com>
---

diff --git a/drivers/xen/netback/netback.c b/drivers/xen/netback/netback.c
index 526f0fe1..7fcca69e 100644
--- a/drivers/xen/netback/netback.c
+++ b/drivers/xen/netback/netback.c
@@ -106,7 +106,7 @@ static inline int netif_page_index(struct page *pg)
 	return idx;
 }
 
-#define PKT_PROT_LEN 64
+#define PKT_PROT_LEN 72
 
 static struct pending_tx_info {
 	netif_tx_request_t req;