Subject: [patch 5/5] [PATCH] qeth: Reduce CPU consumption through less SIGA-r calls

From: [email-masked]
Date: Tue, 15 Nov 2011 13:31:16 +0100

From: Einar Lueck <[email-masked]>

Patch avoids SIGA-r calls in case of SIGA-r required. It only calls
SIGA-r if a threshold of free buffer is reached. CPU consumption is
reduced as a consequence.

Signed-off-by: Einar Lueck <[email-masked]>
Signed-off-by: Frank Blaschka <[email-masked]>
---

 drivers/s390/net/qeth_core.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff -urpN linux-2.6/drivers/s390/net/qeth_core.h linux-2.6-patched/drivers/s390/net/qeth_core.h
--- linux-2.6/drivers/s390/net/qeth_core.h	2011-11-14 18:26:56.000000000 +0100
+++ linux-2.6-patched/drivers/s390/net/qeth_core.h	2011-11-14 18:27:18.000000000 +0100
@@ -236,8 +236,7 @@ static inline int qeth_is_ipa_enabled(st
 #define QETH_IN_BUF_COUNT_MAX 128
 #define QETH_MAX_BUFFER_ELEMENTS(card) ((card)->qdio.in_buf_size >> 12)
 #define QETH_IN_BUF_REQUEUE_THRESHOLD(card) \
-		((card)->ssqd.qdioac1 & AC1_SIGA_INPUT_NEEDED ? 1 : \
-		 ((card)->qdio.in_buf_pool.buf_count / 2))
+		 ((card)->qdio.in_buf_pool.buf_count / 2)
 
 /* buffers we have to be behind before we get a PCI */
 #define QETH_PCI_THRESHOLD_A(card) ((card)->qdio.in_buf_pool.buf_count+1)