From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757142AbcHXX2L (ORCPT ); Wed, 24 Aug 2016 19:28:11 -0400 Received: from skprod3.natinst.com ([130.164.80.24]:34787 "EHLO ni.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752648AbcHXX2H (ORCPT ); Wed, 24 Aug 2016 19:28:07 -0400 From: Xander Huff To: nicolas.ferre@atmel.com Cc: netdev@vger.kernel.org, Nathan Sullivan , linux-kernel@vger.kernel.org, xander.huff@ni.com Subject: [PATCH v2] net: macb: Increase DMA TX buffer size Date: Wed, 24 Aug 2016 17:25:39 -0500 Message-Id: <1472077539-18033-1-git-send-email-xander.huff@ni.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: X-MIMETrack: Itemize by SMTP Server on US-AUS-MGWOut2/AUS/H/NIC(Release 8.5.3FP6 HF1218|December 12, 2014) at 08/24/2016 05:25:46 PM, Serialize by Router on US-AUS-MGWOut2/AUS/H/NIC(Release 8.5.3FP6 HF1218|December 12, 2014) at 08/24/2016 05:34:42 PM, Serialize complete at 08/24/2016 05:34:42 PM X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-08-24_13:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nathan Sullivan In recent testing with the RT patchset, we have seen cases where the transmit ring can fill even with up to 200 txbds in the ring. Increase the size of the DMA TX ring to avoid overruns. Signed-off-by: Xander Huff Signed-off-by: Nathan Sullivan --- drivers/net/ethernet/cadence/macb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index 3256839..3efddb7 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -40,7 +40,7 @@ #define RX_RING_SIZE 512 /* must be power of 2 */ #define RX_RING_BYTES (sizeof(struct macb_dma_desc) * RX_RING_SIZE) -#define TX_RING_SIZE 128 /* must be power of 2 */ +#define TX_RING_SIZE 512 /* must be power of 2 */ #define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE) /* level of occupied TX descriptors under which we wake up TX process */ -- 1.9.1