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qeth: enforce a rate limit for inbound scatter gather messages 

under memory pressure scatter gather mode switching messages must be
rate limited.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Frank Blaschka 2007-08-29 11:26:53 +02:00 committed by Jeff Garzik
parent d0a34f98d1
commit cde4603516
1 changed files with 8 additions and 5 deletions
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13
drivers/s390/net/qeth_main.c
View File

@ -2803,13 +2803,16 @@ qeth_queue_input_buffer(struct qeth_card *card, int index)
if (newcount < count) { if (newcount < count) {
/* we are in memory shortage so we switch back to /* we are in memory shortage so we switch back to
traditional skb allocation and drop packages */ traditional skb allocation and drop packages */
if (atomic_cmpxchg(&card->force_alloc_skb, 0, 1)) if (!atomic_read(&card->force_alloc_skb) &&
printk(KERN_WARNING net_ratelimit())
"qeth: switch to alloc skb\n"); PRINT_WARN("Switch to alloc skb\n");
atomic_set(&card->force_alloc_skb, 3);
count = newcount; count = newcount;
} else { } else {
if (atomic_cmpxchg(&card->force_alloc_skb, 1, 0)) if ((atomic_read(&card->force_alloc_skb) == 1) &&
printk(KERN_WARNING "qeth: switch to sg\n"); net_ratelimit())
PRINT_WARN("Switch to sg\n");
atomic_add_unless(&card->force_alloc_skb, -1, 0);
} }
/* /*