Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753887AbaGJNu7 (ORCPT ); Thu, 10 Jul 2014 09:50:59 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:48052 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753845AbaGJNu6 (ORCPT ); Thu, 10 Jul 2014 09:50:58 -0400 Date: Thu, 10 Jul 2014 06:50:51 -0700 From: Christoph Hellwig To: Benjamin LaHaise Cc: "Elliott, Robert (Server Storage)" , Jens Axboe , "dgilbert@interlog.com" , James Bottomley , Bart Van Assche , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: scsi-mq V2 Message-ID: <20140710135051.GA28227@infradead.org> References: <1403715121-1201-1-git-send-email-hch@lst.de> <20140708144829.GA5539@infradead.org> <53BD7041.5010300@interlog.com> <53BD9A24.7010203@kernel.dk> <94D0CD8314A33A4D9D801C0FE68B402958B9628B@G9W0745.americas.hpqcorp.net> <20140710062040.GB20146@infradead.org> <20140710133609.GO12478@kvack.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140710133609.GO12478@kvack.org> User-Agent: Mutt/1.5.23 (2014-03-12) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 10, 2014 at 09:36:09AM -0400, Benjamin LaHaise wrote: > There is one possible concern that could be exacerbated by other changes in > the system: if the application is running close to the bare minimum number > of requests allocated in io_setup(), the per cpu reference counters will > have a hard time batching things. It might be worth testing with an > increased number of requests being allocated if this is the case. Well, Robert said reverting the two aio commits didn't help. Either he didn't manage to boot into the right kernel, or we need to look elsewhere for the culprit. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/