From 46e1ac0f42c7ff20a7e47c172e4835273b0e6899 Mon Sep 17 00:00:00 2001 From: Ben Hutchings <bhutchings@solarflare.com> Date: Wed, 25 Nov 2009 16:08:30 +0000 Subject: [PATCH] sfc: Fix descriptor cache sizes These were accidentally undersized by a factor of 2, which limited performance. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- drivers/net/sfc/falcon.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c index 41a321b0e8c6..7b19686218a5 100644 --- a/drivers/net/sfc/falcon.c +++ b/drivers/net/sfc/falcon.c @@ -49,11 +49,11 @@ static int disable_dma_stats; * goes idle. */ #define TX_DC_ENTRIES 16 -#define TX_DC_ENTRIES_ORDER 0 +#define TX_DC_ENTRIES_ORDER 1 #define TX_DC_BASE 0x130000 #define RX_DC_ENTRIES 64 -#define RX_DC_ENTRIES_ORDER 2 +#define RX_DC_ENTRIES_ORDER 3 #define RX_DC_BASE 0x100000 static const unsigned int @@ -2974,14 +2974,14 @@ int falcon_init_nic(struct efx_nic *efx) efx_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG); /* Set TX descriptor cache size. */ - BUILD_BUG_ON(TX_DC_ENTRIES != (16 << TX_DC_ENTRIES_ORDER)); + BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER)); EFX_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER); efx_writeo(efx, &temp, FR_AZ_TX_DC_CFG); /* Set RX descriptor cache size. Set low watermark to size-8, as * this allows most efficient prefetching. */ - BUILD_BUG_ON(RX_DC_ENTRIES != (16 << RX_DC_ENTRIES_ORDER)); + BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER)); EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER); efx_writeo(efx, &temp, FR_AZ_RX_DC_CFG); EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8); -- 2.20.1