diff options
| author | Jan Glauber <jang@linux.vnet.ibm.com> | 2012-12-06 14:30:28 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-12-11 14:52:42 +0100 |
| commit | 87bc359b9822a73f264f24f3c1b3e4e7e5ed7d72 (patch) | |
| tree | 643e20ebffcf7eda13ad33c1bbeba82b306738c4 /drivers/s390/cio | |
| parent | 9163003236a52fd1a8ee6ca8a04f7232d001fc98 (diff) | |
s390/pci: speed up __iowrite64_copy by using pci store block insn
Benefit from pci store block instruction by writing up to 128 bytes
with a single instruction to MMIO space. Depending on the workload
this can result in a huge performance increase due to the reduced
number of instructions. The ordering guarantees of single stores
vs. one store block are identical.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio')
0 files changed, 0 insertions, 0 deletions