From: Harish Chegondi <harish.chegondi@xxxxxxxxx> It was determined that 0x880 is a better value for hardware buffering, use it. Reviewed-by: Dean Luick <dean.luick@xxxxxxxxx> Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> Signed-off-by: Harish Chegondi <harish.chegondi@xxxxxxxxx> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx> --- drivers/infiniband/hw/hfi1/chip.c | 4 ++-- drivers/infiniband/hw/hfi1/chip.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index 26c5ee5..88394cd 100644 --- a/drivers/infiniband/hw/hfi1/chip.c +++ b/drivers/infiniband/hw/hfi1/chip.c @@ -13385,9 +13385,9 @@ static void init_rbufs(struct hfi1_devdata *dd) /* * Give up after 1ms - maximum wait time. * - * RBuf size is 148KiB. Slowest possible is PCIe Gen1 x1 at + * RBuf size is 136KiB. Slowest possible is PCIe Gen1 x1 at * 250MB/s bandwidth. Lower rate to 66% for overhead to get: - * 148 KB / (66% * 250MB/s) = 920us + * 136 KB / (66% * 250MB/s) = 844us */ if (count++ > 500) { dd_dev_err(dd, diff --git a/drivers/infiniband/hw/hfi1/chip.h b/drivers/infiniband/hw/hfi1/chip.h index 92f2485..9234525 100644 --- a/drivers/infiniband/hw/hfi1/chip.h +++ b/drivers/infiniband/hw/hfi1/chip.h @@ -82,7 +82,7 @@ */ #define CM_VAU 3 /* HFI link credit count, AKA receive buffer depth (RBUF_DEPTH) */ -#define CM_GLOBAL_CREDITS 0x940 +#define CM_GLOBAL_CREDITS 0x880 /* Number of PKey entries in the HW */ #define MAX_PKEY_VALUES 16 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html