From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kok, Auke" Subject: [PATCH 21/23] ixgb: combine more rx descriptors to improve performance Date: Tue, 19 Sep 2006 10:29:20 -0700 Message-ID: <20060919172920.4605.24456.stgit@gitlost.site> References: <20060919172623.4605.56860.stgit@gitlost.site> Cc: netdev@vger.kernel.org, "Brandeburg, Jesse" , "Kok, Auke" , "Kok, Auke" , "Ronciak, John" Return-path: Received: from [63.64.152.142] ([63.64.152.142]:31757 "EHLO gitlost.site") by vger.kernel.org with ESMTP id S1030358AbWISRUZ (ORCPT ); Tue, 19 Sep 2006 13:20:25 -0400 To: "Garzik, Jeff" In-Reply-To: <20060919172623.4605.56860.stgit@gitlost.site> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org We experimented with more descriptor buffer writebacks and found that values larger than 8 give HW problems, but 8 is safe and gives us some improved performance. Signed-off-by: Jesse Brandeburg Signed-off-by: Auke Kok --- drivers/net/ixgb/ixgb.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/net/ixgb/ixgb.h b/drivers/net/ixgb/ixgb.h index a1a7f3b..50ffe90 100644 --- a/drivers/net/ixgb/ixgb.h +++ b/drivers/net/ixgb/ixgb.h @@ -111,7 +111,7 @@ struct ixgb_adapter; #define IXGB_RXBUFFER_16384 16384 /* How many Rx Buffers do we bundle into one write to the hardware ? */ -#define IXGB_RX_BUFFER_WRITE 4 /* Must be power of 2 */ +#define IXGB_RX_BUFFER_WRITE 8 /* Must be power of 2 */ /* only works for sizes that are powers of 2 */ #define IXGB_ROUNDUP(i, size) ((i) = (((i) + (size) - 1) & ~((size) - 1))) --- Auke Kok