From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gordan Bobic Subject: Re: Xen 4.2.2 / KVM / VirtualBox benchmark on Haswell Date: Tue, 09 Jul 2013 17:26:12 +0100 Message-ID: References: "\"<51DC2BE3.7000009@xen.org>" "\"<2368A3FCF9F7214298E53C823B0A48EC034B1E@LONPEX01CL02.citrite.net>\\\" <1373385207.63214.YahooMailNeo@web171302.mail.ir2.yahoo.com> <2368A3FCF9F7214298E53C823B0A48EC034B52@LONPEX01CL02.citrite.net>" <7a01e6656292e09ae5e9d0b79d5984d0@mail.shatteredsilicon.net>" <2368A3FCF9F7214298E53C823B0A48EC034B8A@LONPEX01CL02.citrite.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <2368A3FCF9F7214298E53C823B0A48EC034B8A@LONPEX01CL02.citrite.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Thanos Makatos Cc: Ian Murray , "lars.kurth@xen.org" , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On Tue, 9 Jul 2013 16:21:52 +0000, Thanos Makatos wrote: >> > IMO it's a bad thing because it's far from a representative >> benchmark, >> > which can lead to wrong conclusions when evaluation I/O >> performance. >> >> Ancient doesn't mean non-representative. A good file-system >> benchmark > > In this particular case it is: PostMark is a single-threaded > application that performs read and write operations on a fixed set of > files, at an unrealistically low directory depth; modern I/O > workloads > exhibit much more complicated behaviour than this. Unless you are running a mail server. Granted, running multiple postmarks in parallel might be a better test on today's many-core servers, but it'd likely make no little or no difference on a disk I/O bound test. Gordan