| commit | 87bc359b9822a73f264f24f3c1b3e4e7e5ed7d72 | [log] [tgz] |
|---|---|---|
| author | Jan Glauber <jang@linux.vnet.ibm.com> | Thu Dec 06 14:30:28 2012 +0100 |
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | Tue Dec 11 14:52:42 2012 +0100 |
| tree | 643e20ebffcf7eda13ad33c1bbeba82b306738c4 | |
| 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>