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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A354FC433E0 for ; Thu, 9 Jul 2020 22:48:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87BD5206E2 for ; Thu, 9 Jul 2020 22:48:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726932AbgGIWsJ (ORCPT ); Thu, 9 Jul 2020 18:48:09 -0400 Received: from vps0.lunn.ch ([185.16.172.187]:56176 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726213AbgGIWsJ (ORCPT ); Thu, 9 Jul 2020 18:48:09 -0400 Received: from andrew by vps0.lunn.ch with local (Exim 4.94) (envelope-from ) id 1jtfKo-004OMI-WA; Fri, 10 Jul 2020 00:48:06 +0200 Date: Fri, 10 Jul 2020 00:48:06 +0200 From: Andrew Lunn To: Vladimir Oltean Cc: Tobias Waldekranz , netdev@vger.kernel.org, f.fainelli@gmail.com, hkallweit1@gmail.com Subject: Re: MDIO Debug Interface Message-ID: <20200709224806.GD1014141@lunn.ch> References: <20200709221800.yqnvepm3p57gfxym@skbuf> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200709221800.yqnvepm3p57gfxym@skbuf> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org > And, while we're at it: context switches from a VM to a host are > expensive. And the PHY library polls around 5 MDIO registers per PHY > every second. Just wire up the interrupt. That stops all polling. It would however be good to have details of what QEMU wants. Andrew