[Skiboot] [PATCH] hw/phb3: Increase AIB TX command credit for DMA read in CAPP DMA mode

Stewart Smith stewart at linux.vnet.ibm.com
Mon Jul 25 12:18:52 AEST 2016

Andrew Donnellan <andrew.donnellan at au1.ibm.com> writes:
> When enabling CAPI in DMA mode, set the AIB TX command credits for channel
> 2 (DMA read) to 28, rather than 1. This significantly improves DMA read
> performance in CAPI DMA mode.
> Fixes: 5477148a439f ("phb3: Add support for CAPP DMA mode")
> Reported-by: John Walthour <jwalthour at us.ibm.com>
> Reported-by: Ricardo Mata <ricmata at us.ibm.com>
> Reported-by: Michael Perez <perezma at us.ibm.com>
> Cc: Ian Munsie <imunsie at au1.ibm.com>
> Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> ---
>  hw/phb3.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)

Merged to master as of 9484d469fa9da4eb8089d82aa2c112c73e0cf50b

Stewart Smith
OPAL Architect, IBM.

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