Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753744AbbGUNCs (ORCPT ); Tue, 21 Jul 2015 09:02:48 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:60863 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751415AbbGUNCr (ORCPT ); Tue, 21 Jul 2015 09:02:47 -0400 Date: Tue, 21 Jul 2015 06:02:46 -0700 From: Christoph Hellwig To: Jeff Moyer Cc: Christoph Hellwig , Jens Axboe , linux-kernel@vger.kernel.org, dmilburn@redhat.com Subject: Re: [patch] Revert "block: remove artifical max_hw_sectors cap" Message-ID: <20150721130246.GA28676@infradead.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Content-Length: 635 Lines: 14 On Mon, Jul 20, 2015 at 03:17:07PM -0400, Jeff Moyer wrote: > For SAN storage, we've seen initial write and re-write performance drop > 25-50% across all I/O sizes. On locally attached storage, we've seen > regressions of 40% for all I/O types, but only for I/O sizes larger than > 1MB. Workload, and hardare please. An only mainline numbers, not some old hacked vendor kernel, please. -- 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/