kernel_optimize_test/drivers/dma
Dan Williams b9cc98697d ioat3: interrupt coalescing
The hardware automatically disables further interrupts after each event
until rearmed.  This allows a delay to be injected between the occurence
of the interrupt and the running of the cleanup routine.  The delay is
scaled by the descriptor backlog and then written to the INTRDELAY
register which specifies the number of microseconds to hold off
interrupt delivery after an interrupt event occurs.  According to
powertop this reduces the interrupt rate from ~5000 intr/s to ~150
intr/s per without affecting throughput (simple dd to a raid6 array).

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-03-03 21:21:13 -07:00
..
ioat ioat3: interrupt coalescing 2010-03-03 21:21:13 -07:00
ipu dma: cases IPU_PIX_FMT_BGRA32, BGR32 and ABGR32 are the same in ipu_ch_param_set_size() 2010-02-02 23:42:25 -07:00
ppc4xx dma: make Open Firmware device id constant 2010-02-02 23:41:06 -07:00
at_hdmac_regs.h at_hdmac: implement a private tx_list 2009-09-08 17:53:03 -07:00
at_hdmac.c Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2009-12-30 13:46:29 -08:00
coh901318_lli.c Add COH 901 318 DMA block driver v5 2009-11-19 23:45:19 -07:00
coh901318_lli.h Add COH 901 318 DMA block driver v5 2009-11-19 23:45:19 -07:00
coh901318.c drivers/dma: Correct use after free 2009-12-22 15:30:08 -07:00
dmaengine.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-12-14 09:58:24 -08:00
dmatest.c dmatest: fix handling of an even number of xor_sources 2010-02-28 22:20:18 -07:00
dw_dmac_regs.h dw_dmac: implement a private tx_list 2009-09-08 17:53:02 -07:00
dw_dmac.c Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2009-12-30 13:46:29 -08:00
fsldma.c fsldma: Fix cookie issues 2010-02-28 22:18:16 -07:00
fsldma.h fsldma: major cleanups and fixes 2010-02-02 14:51:42 -07:00
iop-adma.c iop-adma.c: use resource_size() 2009-12-11 21:24:33 -07:00
iovlock.c net_dma: poll for a descriptor after allocation failure 2009-09-08 17:38:54 -07:00
Kconfig dma: Add MPC512x DMA driver 2010-03-01 22:16:42 -07:00
Makefile dma: Add MPC512x DMA driver 2010-03-01 22:16:42 -07:00
mpc512x_dma.c dma: Add MPC512x DMA driver 2010-03-01 22:16:42 -07:00
mv_xor.c mv_xor: implement a private tx_list 2009-09-08 17:53:03 -07:00
mv_xor.h mv_xor: implement a private tx_list 2009-09-08 17:53:03 -07:00
shdma.c Merge branch 'ioat' into fixes 2009-12-22 17:21:47 -07:00
shdma.h sh: fix DMA driver's descriptor chaining and cookie assignment 2009-12-17 09:41:39 -07:00
txx9dmac.c const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
txx9dmac.h txx9dmac: implement a private tx_list 2009-09-08 17:53:03 -07:00