Jan Beulich
2007-Mar-12 14:28 UTC
[Xen-devel] [PATCH] linux: Adjust memory allocation condition in netback
.. to reduce memory pressure on Xen and avoid unnecessarily stalling
receives.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Index: head-2007-02-27/drivers/xen/netback/netback.c
==================================================================---
head-2007-02-27.orig/drivers/xen/netback/netback.c 2007-03-01 15:23:00.000000000
+0100
+++ head-2007-02-27/drivers/xen/netback/netback.c 2007-03-12 09:26:17.000000000
+0100
@@ -110,6 +110,7 @@ static unsigned int alloc_index = 0;
static inline unsigned long alloc_mfn(void)
{
+ BUG_ON(!alloc_index);
return mfn_list[--alloc_index];
}
@@ -552,6 +553,7 @@ static void net_rx_action(unsigned long
*(int *)skb->cb = nr_frags;
if (!xen_feature(XENFEAT_auto_translated_physmap) &&
+ !((netif_t *)netdev_priv(skb->dev))->copying_receiver &&
check_mfn(nr_frags + 1)) {
/* Memory squeeze? Back off for an arbitrary while. */
if ( net_ratelimit() )
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