Merge remote-tracking branch 'regmap/fix/debugfs' into tmp

[karo-tx-linux.git] / drivers / net / xen-netfront.c

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index c26e28b4bd9f985a4d7c6d3307d969bb671bf6f7..7ffa43bd7cf9e9f3b1fc43f83d0ec4c53b355765 100644 (file)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1015,29 +1015,10 @@ err:
                i = xennet_fill_frags(np, skb, &tmpq);
 
                /*
-                * Truesize approximates the size of true data plus
-                * any supervisor overheads. Adding hypervisor
-                * overheads has been shown to significantly reduce
-                * achievable bandwidth with the default receive
-                * buffer size. It is therefore not wise to account
-                * for it here.
-                *
-                * After alloc_skb(RX_COPY_THRESHOLD), truesize is set
-                * to RX_COPY_THRESHOLD + the supervisor
-                * overheads. Here, we add the size of the data pulled
-                * in xennet_fill_frags().
-                *
-                * We also adjust for any unused space in the main
-                * data area by subtracting (RX_COPY_THRESHOLD -
-                * len). This is especially important with drivers
-                * which split incoming packets into header and data,
-                * using only 66 bytes of the main data area (see the
-                * e1000 driver for example.)  On such systems,
-                * without this last adjustement, our achievable
-                * receive throughout using the standard receive
-                * buffer size was cut by 25%(!!!).
-                */
-               skb->truesize += skb->data_len - RX_COPY_THRESHOLD;
+                 * Truesize is the actual allocation size, even if the
+                 * allocation is only partially used.
+                 */
+               skb->truesize += PAGE_SIZE * skb_shinfo(skb)->nr_frags;
                skb->len += skb->data_len;
 
                if (rx->flags & XEN_NETRXF_csum_blank)