From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8142B2D7B8; Mon, 5 Aug 2024 15:15:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722870909; cv=none; b=HK7/mnW6aH9pLhLx49nmjREL6atoCTDJcNgas9Qzcxkdtp0Swkl+O1U08TdSzkJtW4jepf1tI3JB3xpKBCGXj8WCOh9UIpq3dClqef/tTCbcq/Jz+TMyj+Uh1MQyCd8btHvnAviu4RM4jXfSSokLQ8PpACemmFHFLduvQTGnims= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722870909; c=relaxed/simple; bh=hEjI7G/mwo/RSGMWGSClW9gSqJ6PBG2hmPpL9j/Bz/s=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=SVAPIPRXEfm4zonh3xlozDttVcLoiOZuOmVNntc2g62NxM9PxfqwhWCTcW241MZESIx9ZlfPeh0FjMd0P4uNg7AvaKNpmsnLfNzDL7Axpo5z+C7vgSqbA4ox4sR/0UST8wZxUAdj4X8l5SkpikfDdj3lThQ/QQQo02o1QnCVSHE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=bTYNpAmF; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="bTYNpAmF" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=odYhL10aGT5OasfIueuuGPU6JgBCgXOLpbIAhkKv+Gc=; b=bTYNpAmFXj2qriAOV+gcbP3foS j29RgYDtktjL39ONRllYd6zLpM+3ykUHscEQ1EAbnF+Sm1HOzPBK7p3vBpBVOVoKgL01pfgu0fjCR /bVNIU08KPKpBeQk080/vOHWWEWjccfMA1QY+hb37Tq/pwLL89/QWFdb11duOofIspeUZpd8PMuSo l5C2lOAzCVXQoc4AQk5DFqspLHiyWXsJrRzgRT78tfvthvuVzzTY+shzcnDPrrjqTUuYwpL1sv0Ra UHnysdc4SuHwiyn4gfOeLKMEu7rpoCeu+b7SYWHGNxXrMbpY9XBoN5tOWVzaQBs9/V5tt1XkZWsfY PqlyG72A==; Received: from willy by casper.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1sazQK-00000004O32-27sM; Mon, 05 Aug 2024 15:15:00 +0000 Date: Mon, 5 Aug 2024 16:15:00 +0100 From: Matthew Wilcox To: 412574090@163.com Cc: corbet@lwn.net, bhelgaas@google.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, xiongxin@kylinos.cn, weiyufeng Subject: Re: [PATCH] PCI: limit pci bridge and subsystem speed to 2.5GT/s Message-ID: References: <20240805092010.82986-1-412574090@163.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240805092010.82986-1-412574090@163.com> On Mon, Aug 05, 2024 at 05:20:10PM +0800, 412574090@163.com wrote: > From: weiyufeng > > Add a kernel command-line option 'speed2_5g' to limit pci bridge > and subsystem devices speed to 2.5GT/s. As a debug method, this > provide for developer to temporarily slow down PCIe devices for > verification. I am opposed to this patch benig merged. There's no harm to keep it for your own testing.