From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (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 E30D01B278 for ; Thu, 25 Jan 2024 08:15:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.95.11.211 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706170511; cv=none; b=rEAFd/m6nwGsQLC37ZYgwB4r/N5TqnTgsIZRDvio+Vkx+3b4kJxl1JsH00pDMsTuOnRpt1ImJimnu+UgXsei436gxEjeY0UNyGVWQDyqMXh58orFWyb2wetRpIV7Us0iplcawmNgY3LTNvNIhx77KO/Qo2VJlqSlv+neqQdELN0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706170511; c=relaxed/simple; bh=HkAPa/4QG3yJRZwFPBPBelviLjeV+wcyoIRAeNov33Y=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=CFEGx7/jXgWO3rMdGXW16fCJ4VPRXugzt5OXOIu1ZYbm++v/QeOcdVctLziecIS31KLgp9R2zDjteGj9v/8ETXsAiJjjMCIu7i0w2BalLaQUR0bpgIHnaSJz50kS0rtINWJlfqtz9kklUae0lxMoyv7P/uGhBcj/g7U3oKvg3Aw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=pass smtp.mailfrom=lst.de; arc=none smtp.client-ip=213.95.11.211 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lst.de Received: by verein.lst.de (Postfix, from userid 2407) id 0C5CB67373; Thu, 25 Jan 2024 09:15:04 +0100 (CET) Date: Thu, 25 Jan 2024 09:15:02 +0100 From: Christoph Hellwig To: "Pankaj Raghav (Samsung)" Cc: Christoph Hellwig , axboe@kernel.dk, linux-block@vger.kernel.org, p.raghav@samsung.com Subject: Re: can we drop the bio based path in null_blk Message-ID: <20240125081502.GC21006@lst.de> References: <20240123084942.GA29949@lst.de> Precedence: bulk X-Mailing-List: linux-block@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: User-Agent: Mutt/1.5.17 (2007-11-01) On Wed, Jan 24, 2024 at 09:31:25PM +0100, Pankaj Raghav (Samsung) wrote: > The subject says removing the bio mode in null_blk but here you are > asking an open question about the non-so-relevant ones should move to > blk-mq. My input is for the latter part, FWIW. Well, it's two different things. My prime concern right now is null_blk, which is very clumsy due to the two different I/O paths, and actually broken in that the bio mode doesn't respect various I/O limits that can be configured, and at least in zone modes also ones that aren't configured but required (I/Os spanning zones).