From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7998C4361B for ; Wed, 9 Dec 2020 06:52:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EBEA23B7D for ; Wed, 9 Dec 2020 06:52:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728260AbgLIGvZ (ORCPT ); Wed, 9 Dec 2020 01:51:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728171AbgLIGvZ (ORCPT ); Wed, 9 Dec 2020 01:51:25 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CDA4C0613CF; Tue, 8 Dec 2020 22:50:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=p3OfvBVBtRAqDDRF6jH5uPYTH91JIUpZ9ujYw2CtzVk=; b=g9JtDQAysQXn5mU2ddEzM0Yz5X P0zL8DTzb0K6qveIRiZOvKGrPalspGEXG5XQvVJFn1HUW8Xbc82Z4Eih/aVBu92sIDrYNyKwElnMj C30/WIr2b5j+YXLZhuo9wLDMX+5Rtopo8rbf+4+QlewnIsTrzzHXRIqe3Bkx3lqWfef9Ngn/NwPDI Q6Z63bXV4xlz46pj18EXMDR2z6K3sr9RSj7Mnf/Nvtk9TqcX/Ef3mGgdvfxg+KmWDVNgVXOzq6sA1 d3p0rvFQdNOF0cyN5mPJt+B7iY+6Dkv1RqNBayBOb4fgELniBnPEWNN6ldEYGeTaZcnfoUzU/gCVQ zR3SN0AA==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmtJA-0007Oz-Ky; Wed, 09 Dec 2020 06:50:40 +0000 Date: Wed, 9 Dec 2020 06:50:40 +0000 From: Christoph Hellwig To: Pavel Begunkov Cc: Jens Axboe , Alexander Viro , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Matthew Wilcox , Ming Lei , Johannes Weiner Subject: Re: [RFC 0/2] nocopy bvec for direct IO Message-ID: <20201209065040.GA27959@infradead.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Wed, Dec 09, 2020 at 02:19:50AM +0000, Pavel Begunkov wrote: > A benchmark got me 430KIOPS vs 540KIOPS, or +25% on bare metal. And perf > shows that bio_iov_iter_get_pages() was taking ~20%. The test is pretty > silly, but still imposing. I'll redo it closer to reality for next > iteration, anyway need to double check some cases. That is pretty impressive. But I only got this cover letter, not the actual patches..