From e8a70af286bea28feb4785efb5c0b9229e67e008 Mon Sep 17 00:00:00 2001 From: Harish Chegondi Date: Sun, 25 Sep 2016 07:42:01 -0700 Subject: IB/hfi1: Adjust hardware buffering parameter It was determined that 0x880 is a better value for hardware buffering, use it. Reviewed-by: Dean Luick Reviewed-by: Dennis Dalessandro Signed-off-by: Harish Chegondi Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford 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 -- cgit v0.10.2