Dan Williams c50a898fd4 ioat2: fix performance regression ... Commit 0793448 "DMAENGINE: generic channel status v2" changed the interface for how dma channel progress is retrieved. It inadvertently exported an internal helper function ioat_tx_status() instead of ioat_dma_tx_status(). The latter polls the hardware to get the latest completion state, while the helper just evaluates the current state without touching hardware. The effect is that we end up waiting for completion timeouts or descriptor allocation errors before the completion state is updated. iperf (before fix): [SUM] 0.0-41.3 sec 364 MBytes 73.9 Mbits/sec iperf (after fix): [SUM] 0.0- 4.5 sec 499 MBytes 940 Mbits/sec This is a regression starting with 2.6.35. Cc: <stable@kernel.org> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Jesse Brandeburg <jesse.brandeburg@intel.com> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Maciej Sosnowski <maciej.sosnowski@intel.com> Reported-by: Richard Scobie <richard@sauce.co.nz> Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2010-10-13 15:43:10 -07:00
..
dca.c	ioat3: dca and raid operations are incompatible	2009-11-19 17:07:10 -07:00
dma.c	Merge branch 'ioat' into dmaengine	2010-05-17 16:30:58 -07:00
dma.h	ioat2: catch and recover from broken vtd configurations v6	2010-08-04 14:18:17 -07:00
dma_v2.c	ioat2: fix performance regression	2010-10-13 15:43:10 -07:00
dma_v2.h	ioat2,3: convert to producer/consumer locking	2010-05-01 15:22:55 -07:00
dma_v3.c	ioat2: catch and recover from broken vtd configurations v6	2010-08-04 14:18:17 -07:00
hw.h	ioat3: dca and raid operations are incompatible	2009-11-19 17:07:10 -07:00
Makefile	ioat3: split ioat3 support to its own file, add memset	2009-09-08 17:42:55 -07:00
pci.c	ioat: Remove duplicated devm_kzalloc() calls for ioatdma_device	2010-05-02 12:52:35 -07:00
registers.h	ioat3: interrupt coalescing	2010-03-03 21:21:13 -07:00