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qeth: Reduce CPU consumption through less SIGA-r calls 

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>
This commit is contained in:
Einar Lueck 2011-11-15 02:31:16 +00:00 committed by David S. Miller
parent 1d36cb479f
commit 0284a0fdf3
1 changed files with 1 additions and 2 deletions
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3
drivers/s390/net/qeth_core.h
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@ -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)