From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BBADC46CA0 for ; Mon, 27 Nov 2023 16:04:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234298AbjK0QEB (ORCPT ); Mon, 27 Nov 2023 11:04:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234276AbjK0QD7 (ORCPT ); Mon, 27 Nov 2023 11:03:59 -0500 Received: from vps0.lunn.ch (vps0.lunn.ch [156.67.10.101]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 341F5DD; Mon, 27 Nov 2023 08:04:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Disposition:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:From:Sender:Reply-To:Subject: Date:Message-ID:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Content-Disposition:In-Reply-To:References; bh=gD6ndoFSiIawhejTksq7339holqrYq7T22/Pc0bwGD0=; b=2Juu8c4dNms+1ahcAz7GTNR+EX alFo2SGFqf5yEolR92f1nWCAuInJqBdf6ha3vyP3LHEymyEAda7ljySui06PxXE0y3eEl285Gdnw9 BMm5Ow0I8hY8TmxSIp5JG6cmVVcrt3tIybtxofy9q+2hCmECLFwrbfl2SqXOdahflzbg=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1r7e5S-001MhD-JX; Mon, 27 Nov 2023 17:03:54 +0100 Date: Mon, 27 Nov 2023 17:03:54 +0100 From: Andrew Lunn To: =?iso-8859-1?Q?Ram=F3n?= Nordin Rodriguez Cc: Heiner Kallweit , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/3] net: microchip_t1s: additional phy support and collision detect handling Message-ID: <270f74c0-4a1d-4a82-a77c-0e8a8982e80f@lunn.ch> References: <20231127104045.96722-1-ramon.nordin.rodriguez@ferroamp.se> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > * 3-4 nodes (depending on how many usb ports and dongles I have) > * run iperf with long cables and CSMA/CD > * run iperf with long cables and CMSA/No CD > > I'll report back the results. Anything you'd like to add/focus on with > evaluation? Humm, thinking about how CSMA/CD works... Maybe look at what counters the MAC provides. Does it have collisions and bad FCS? A collision should result in a bad FCS, if you are not using CD. So if things are working correctly, the count for CD should move to FCS if you turn CD off. If CD is falsely triggering, FCS as a % should not really change, but you probably get more frames over the link? Andrew