Patchwork [5/5] qeth: Reduce CPU consumption through less SIGA-r calls

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Submitter frank.blaschka@de.ibm.com
Date Nov. 15, 2011, 12:31 p.m.
Message ID <20111115123152.686856892@de.ibm.com>
Download mbox | patch
Permalink /patch/125771/
State Accepted
Delegated to: David Miller
Headers show

Comments

frank.blaschka@de.ibm.com - Nov. 15, 2011, 12:31 p.m.
From: Einar Lueck <elelueck@de.ibm.com>

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>
---

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


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Patch

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)