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Commit 0284a0fdf3def1beb4de509f87472520b23883c9

Authored by Einar Lueck
Committed by David S. Miller
1 parent 1d36cb479f
Exists in master and in 6 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

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>

Showing 1 changed file with 1 additions and 2 deletions Side-by-side Diff

drivers/s390/net/qeth_core.h
Diff comments   View file @ 0284a0f
... ... @@ -236,8 +236,7 @@
236 236 #define QETH_IN_BUF_COUNT_MAX 128
237 237 #define QETH_MAX_BUFFER_ELEMENTS(card) ((card)->qdio.in_buf_size >> 12)
238 238 #define QETH_IN_BUF_REQUEUE_THRESHOLD(card) \
239   - ((card)->ssqd.qdioac1 & AC1_SIGA_INPUT_NEEDED ? 1 : \
240   - ((card)->qdio.in_buf_pool.buf_count / 2))
  239 + ((card)->qdio.in_buf_pool.buf_count / 2)
241 240  
242 241 /* buffers we have to be behind before we get a PCI */
243 242 #define QETH_PCI_THRESHOLD_A(card) ((card)->qdio.in_buf_pool.buf_count+1)