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Commit 0284a0fd authored by Einar Lueck's avatar Einar Lueck Committed by David S. Miller
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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: default avatarEinar Lueck <elelueck@de.ibm.com>
Signed-off-by: default avatarFrank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1d36cb47

drivers/s390/net/qeth_core.h

+1 −2
Original line number Diff line number Diff line
@@ -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)