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 9A6032F363C; Fri, 23 Jan 2026 14:01:07 +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=1769176869; cv=none; b=lWfwLYw/KneY68u7EBSrrI6cbE3uLVZ+vYKUa7Zcpa38wCCLpG3wXn2uqdfhvyDvtxmhEgm1ZmlrODikR+JMlrspzJf9ual/AaRz8fSomS+hCVMlWwmrRvleOfhosiaVfe9tuQwcYm+MSy2tgQaFMp0Cg302eaQPXemsx0w/7Ec= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769176869; c=relaxed/simple; bh=RhQrGwadHS37/U6tcxYq4WpnbRJOXNKQUoVjLBnyBWs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pLY4ASfszRp+h23qkeUYgrFgHLyzs5FheFLcY0rtWSK7qOsHjxOf6Ie3D75I3bM29L9p+K6hdpCxmkeyyYjYwvIvjSVCzuJfMpS/zJm/hEA8pCLMay4stmleYa6gxqJHSFF608Pqj6cHTVPPpb7QuhS46HY+PUFPWFPaKHpq9d4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=pass (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 895C0227AAE; Fri, 23 Jan 2026 15:01:03 +0100 (CET) Date: Fri, 23 Jan 2026 15:01:02 +0100 From: Christoph Hellwig To: Anuj Gupta Cc: Christoph Hellwig , Jens Axboe , Christian Brauner , "Darrick J. Wong" , Carlos Maiolino , Qu Wenruo , Al Viro , linux-block@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: bounce buffer direct I/O when stable pages are required v2 Message-ID: <20260123140102.GA24714@lst.de> References: <20260119074425.4005867-1-hch@lst.de> <20260123121026.tujkvhxixr6pgz7c@green245.gost> Precedence: bulk X-Mailing-List: linux-fsdevel@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: <20260123121026.tujkvhxixr6pgz7c@green245.gost> User-Agent: Mutt/1.5.17 (2007-11-01) On Fri, Jan 23, 2026 at 05:40:26PM +0530, Anuj Gupta wrote: > I ran experiments[1] on two devices - Samsung PM1733 and Intel Optane > with PI enabled (4K + 8b format). Thanks for the additional benchmarking on more beefy devices! > On my setup, I didn't observe any > noticeable difference for sequential write workloads. Sequential reads, > however, show a clear performance drop while using bounce buffering, > which is expected. > Used these fio commands listed below[2] > > Feel free to add: > Tested-by: Anuj Gupta