From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:38450 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751415AbaLBAPE (ORCPT ); Mon, 1 Dec 2014 19:15:04 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Xvb7O-0003Fv-Qo for linux-btrfs@vger.kernel.org; Tue, 02 Dec 2014 01:15:02 +0100 Received: from 50.245.141.77 ([50.245.141.77]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 02 Dec 2014 01:15:02 +0100 Received: from eternaleye by 50.245.141.77 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 02 Dec 2014 01:15:02 +0100 To: linux-btrfs@vger.kernel.org From: Alex Elsayed Subject: Re: [RFC PATCH] Btrfs: add sha256 checksum option Date: Mon, 01 Dec 2014 16:10:05 -0800 Message-ID: References: <1416806586-18050-1-git-send-email-bo.li.liu@oracle.com> <20141125163905.GJ26471@twin.jikos.cz> <547C618C.8020201@gmail.com> <547CA870.9040904@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Sender: linux-btrfs-owner@vger.kernel.org List-ID: Alex Elsayed wrote: > So CityHash is - at best - half as fast as SHA1 with acceleration. > > In fact, on the Apple A7, it would likely be slower than _software_ SHA-1. Argh, ignore this. The CityHash readme is in bytes/cycle, which I missed on first readthrough (why on earth they are not using either MB/s for rate, or cycles/byte, eludes me completely.)