kernel/linux.git/drivers/dma/ioat/sysfs.c, branch linux-4.16.yLinux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=linux-4.16.y2017-08-23T16:02:21+00:00dmaengine: ioatdma: Add intr_coalesce sysfs entry2017-08-23T16:02:21+00:00Ujjal Singhujjal.singh@intel.com2017-08-23T00:31:18+00:00urn:sha1:268e2519f5b7101d707a0df32e628e9990bc0da6
We observed performance increase with DMA copy from memory
to MMIO by changing the interrupt coalescing value to 0.
The previous set value was projected on the C5xxx Xeon
platform and no longer holds true. Removing hard coded
value and providing a tune-able in sysfs in order to allow
user to tune this on a per channel basis. By default this
value will be set to 0.
Example of sysfs variable importing for interrupt coalescing
value from command line:
echo 5> /sys/devices/pci0000:00/0000:00:04.0/dma/dma0chan0/
quickdata/intr_coalesce
Reported-by: Nithin Sujir <nsujir@tintri.com>
Signed-off-by: Ujjal Singh <ujjal.singh@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
dmaengine: ioatdma: move all sysfs related code2015-08-17T08:07:30+00:00Dave Jiangdave.jiang@intel.com2015-08-11T15:48:38+00:00urn:sha1:80b1973659949fbdcbfe9e086e2370313a9f1288
Move and fixup all sysfs related bits to sysfs.c file.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>