From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f43.google.com (mail-wm0-f43.google.com [74.125.82.43]) by dpdk.org (Postfix) with ESMTP id 522618E93 for ; Mon, 23 Nov 2015 15:46:00 +0100 (CET) Received: by wmww144 with SMTP id w144so99351933wmw.1 for ; Mon, 23 Nov 2015 06:46:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=xGm7DDJxDsIb25sy70NSAE6ShJ1SirMIOeZN32Gdq5U=; b=RufMayBs+ftwf4k8oKKuhKM9TeeoNVgYIX39khSltAUc1oTOeOHEwfmFv+yVbFE/N5 ZUDjLsZ77gtQixxVg6TJEdHa9wVBvft8JrAmN9Ltqsw8dxqnISlwGUVPF4u2+w3Ak/MD 9R92zV6OHSoMyIXwCU5o4zVgHyu45qW/uHH6+Glxrld7uo/x6Y3h5LclvdAuA27GPULF JkKfmimTMY9xQNjXfFNbpIaUY2qnDWkGmoC5X6DpHvVL3qn+bjq6cIgY+QILhtvgWGc6 92DMVjhe7dEC/k/654iEbE+iJmFZcbI6EId4dr7jER+xCIbVvGvpDk5dhZSmdjUWCrwG 30kA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=xGm7DDJxDsIb25sy70NSAE6ShJ1SirMIOeZN32Gdq5U=; b=brU0mFSpNcDKRe9rJnRElLvfLGBR3s6eakCRli83HzJDsN/N8lyCHC0EsOEQXSaG1/ ihx3nCidWZopTye+2NmqGcfBjbxxPuE4xDKseIz0dzsv8+CnxN77JNMlVpaLFDP9qU00 q/X/tzDQwoC60TpZMMx7jzmyn2W2IoPeAqD/BshTNFy34c/FtUDwu5hAw2loQmBXqfuh PNH6uqmZUXETlk3ZvJiPkoWo5oEtpzSsKS6nRN+jwn6a/mUdaRFdMkZfs3fg5GXbEmQM h7otfd2mPhKmFLUkpt5MBSasDC2lZrfvJxvGRqmWGFGApjGwSjG/+q5LUn9w7FEhIbh5 4tVg== X-Gm-Message-State: ALoCoQkMsOTghJpJPxyei4UMovvylHYJbD8aFc6ckN8I3vPTcR3acr9FtSMsWizIKoZZqBbASVOM X-Received: by 10.194.7.230 with SMTP id m6mr14576304wja.124.1448289960217; Mon, 23 Nov 2015 06:46:00 -0800 (PST) Received: from 6wind.com (guy78-3-82-239-227-177.fbx.proxad.net. [82.239.227.177]) by smtp.gmail.com with ESMTPSA id bg10sm13574983wjb.46.2015.11.23.06.45.58 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 23 Nov 2015 06:45:59 -0800 (PST) From: Adrien Mazarguil To: dev@dpdk.org Date: Mon, 23 Nov 2015 15:44:49 +0100 Message-Id: <1448289889-9590-15-git-send-email-adrien.mazarguil@6wind.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1448289889-9590-1-git-send-email-adrien.mazarguil@6wind.com> References: <1448289889-9590-1-git-send-email-adrien.mazarguil@6wind.com> Subject: [dpdk-dev] [PATCH 14/14] mlx5: add environment variables section to documentation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Nov 2015 14:46:00 -0000 From: Olga Shern Describe how applications can benefit from CQE compression. Signed-off-by: Olga Shern Signed-off-by: Adrien Mazarguil --- doc/guides/nics/mlx5.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst index 2d68914..eb8c042 100644 --- a/doc/guides/nics/mlx5.rst +++ b/doc/guides/nics/mlx5.rst @@ -130,6 +130,19 @@ These options can be modified in the ``.config`` file. This value is always 1 for RX queues since they use a single MP. +Environment variables +~~~~~~~~~~~~~~~~~~~~~ + +- ``MLX5_ENABLE_CQE_COMPRESSION`` + + A nonzero value lets ConnectX-4 return smaller completion entries to + improve performance when PCI backpressure is detected. It is most useful + for scenarios involving heavy traffic on many queues. + + Since the additional software logic necessary to handle this mode can + lower performance when there is no backpressure, it is not enabled by + default. + Run-time configuration ~~~~~~~~~~~~~~~~~~~~~~ -- 2.1.0