Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750938AbeABU3C (ORCPT + 1 other); Tue, 2 Jan 2018 15:29:02 -0500 Received: from out2-smtp.messagingengine.com ([66.111.4.26]:49845 "EHLO out2-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750745AbeABU3B (ORCPT ); Tue, 2 Jan 2018 15:29:01 -0500 X-ME-Sender: Date: Tue, 2 Jan 2018 12:28:59 -0800 From: Andres Freund To: Linus Torvalds Cc: Linux Kernel Mailing List Subject: Re: Linux 4.15-rc6 Message-ID: <20180102202859.4fvvrtngnitwzfym@alap3.anarazel.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On 2017-12-31 14:57:51 -0800, Linus Torvalds wrote: > With all the x86 pti work coming in late in the rc like this, I'm by > now almost guaranteed to do an rc8 this release, not because there are > any known problems, but simply because of the timing of the patches. > > Go forth and test, I thought it'd be interesting to run a short benchmark to be able to estimate the impact of the PTI work on postgres workloads (which I work on). On my skylake laptop, a memory resident, OLTP workload with 16 connections results in: pti=on: tps = 220791.228297 (including connections establishing) tps = 220836.842052 (excluding connections establishing) pti=off: tps = 236629.778328 (including connections establishing) tps = 236646.598274 (excluding connections establishing) model name : Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz This isn't a complaint, I just thought it might be useful information. If it helps for anything/anybody, I'm happy to run additional benchmarks / provide additional information. - Andres