linux/drivers/dma/ioat
Ujjal Singh 268e2519f5 dmaengine: ioatdma: Add intr_coalesce sysfs entry
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>
2017-08-23 21:32:21 +05:30
..
Makefile dmaengine: ioatdma: removal of dma_v3.c and relevant ioat3 references 2015-08-17 13:37:30 +05:30
dca.c dmaengine: Replace WARN_TAINT_ONCE() with pr_warn_once() 2017-06-15 09:50:37 +05:30
dma.c dmaengine: ioatdma: Add intr_coalesce sysfs entry 2017-08-23 21:32:21 +05:30
dma.h dmaengine: ioatdma: Add intr_coalesce sysfs entry 2017-08-23 21:32:21 +05:30
hw.h dmaengine: ioatdma: Add Skylake PCI Dev ID 2017-01-02 08:12:59 +05:30
init.c dmaengine: ioat: constify pci_device_id. 2017-07-18 21:32:14 +05:30
prep.c dmaengine: ioatdma: Squelch framesize warnings 2016-01-25 09:49:55 +05:30
registers.h i7300_idle: Remove this driver 2016-11-18 12:07:56 +01:00
sysfs.c dmaengine: ioatdma: Add intr_coalesce sysfs entry 2017-08-23 21:32:21 +05:30