From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: command emulation fix Date: Thu, 19 Jan 2017 15:45:34 -0500 Message-ID: <20170119204534.GE25390@mtj.duckdns.org> References: <1484412602-11801-1-git-send-email-hch@lst.de> <20170115230723.GB14446@mtj.duckdns.org> <20170116152120.GA16072@lst.de> <20170118191750.GA9171@mtj.duckdns.org> <20170119143551.GA31203@lst.de> <20170119202316.GA25390@mtj.duckdns.org> <20170119202725.GB6403@lst.de> <20170119203458.GC25390@mtj.duckdns.org> <20170119203646.GD25390@mtj.duckdns.org> <20170119204135.GA6675@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pf0-f194.google.com ([209.85.192.194]:34255 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751292AbdASUxv (ORCPT ); Thu, 19 Jan 2017 15:53:51 -0500 Received: by mail-pf0-f194.google.com with SMTP id y143so3974937pfb.1 for ; Thu, 19 Jan 2017 12:53:51 -0800 (PST) Content-Disposition: inline In-Reply-To: <20170119204135.GA6675@lst.de> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Christoph Hellwig Cc: linux-ide@vger.kernel.org Hello, On Thu, Jan 19, 2017 at 09:41:35PM +0100, Christoph Hellwig wrote: > On Thu, Jan 19, 2017 at 03:36:46PM -0500, Tejun Heo wrote: > > But do you actually expect there to be scalability issues around this > > buffer? Its uses are extremely short and libata operations are pretty > > strongly synchronized to begin with. > > Mostly for setups using JBODs with massive numbers of SATA disks. > > This would mostly not be ahci or a real ATA driver but libsas calling > into libata for the translation. Ah, understood. Thanks for the explanation. -- tejun