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 C626284FA9 for ; Tue, 2 Apr 2024 13:41:26 +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=1712065289; cv=none; b=joZMd5bj7CCH4L+sMfUT1LkjHdCUQMLOtlRgURO7mL2/pEkHJAiCirkcZd3QH32U2FslnZS034+2kB91aGg7gTPexvWgXJfo77i5nLzAYbPiQ9Apzn8Rmbw2fZZBOmnNLibbkYwjYALLjj2KaS9bG8OXS62lPiADupaQvxqZq7o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712065289; c=relaxed/simple; bh=LJRp/o/snXbteNfIzYceTw49QE5yUFX2M9jHONkQAgE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=f8VIVWa0Ettb3lZyWu044Foq0ghVjw3JWaY/EXrRFMIH61bCsck5j3zsB8WbVTjnj+BUqwpEp5aXrMONI/9JgfOqRhZoDJHfkxLiYjqxCOAujFydWlK0SpT9B0Q2193XrBvpMUCdAJ5YeYiqL2P5oWUsFm5LKaQZ7AUGsLOJWtM= 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 3065D68BFE; Tue, 2 Apr 2024 15:41:23 +0200 (CEST) Date: Tue, 2 Apr 2024 15:41:23 +0200 From: Christoph Hellwig To: Hannes Reinecke Cc: Christoph Hellwig , "linux-block@vger.kernel.org" Subject: Re: Oddities in brd queue limits Message-ID: <20240402134123.GA32562@lst.de> References: <0cba8c5d-f014-4e48-9a6f-7724cf939c5c@suse.de> <20240402131822.GA32081@lst.de> <985db17d-691a-4674-8e2d-962ac9a8af1f@suse.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: <985db17d-691a-4674-8e2d-962ac9a8af1f@suse.de> User-Agent: Mutt/1.5.17 (2007-11-01) On Tue, Apr 02, 2024 at 03:21:00PM +0200, Hannes Reinecke wrote: > So is it a hard limit (as in: we cannot send I/O smaller than that) > or a soft limit (as in: we should not send I/O smaller than that)? It is a completely soft hint that isn't used by anything in the kernel I/O path. (as a quick grep would tell..)