qeth: Reduce CPU consumption through less SIGA-r calls
authorEinar Lueck <elelueck@de.ibm.com>
Tue, 15 Nov 2011 02:31:16 +0000 (02:31 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 16 Nov 2011 22:28:20 +0000 (17:28 -0500)
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 <elelueck@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/s390/net/qeth_core.h

index b77c65ed13812f9d7e5462c0bcb5bcb9c1fa33f1..4abc79d3963f86ee2dc7dfd14c1fb240bf2eb540 100644 (file)
@@ -236,8 +236,7 @@ static inline int qeth_is_ipa_enabled(struct qeth_ipa_info *ipa,
 #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)