From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brad Campbell Subject: Re: Raid-0 speed Date: Thu, 26 Aug 2004 08:36:09 +0400 Sender: linux-raid-owner@vger.kernel.org Message-ID: <412D68B9.2080304@wasp.net.au> References: <412C1E23.1070104@wasp.net.au> <20040825211158.1242221a@vovapc.kpml.int> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20040825211158.1242221a@vovapc.kpml.int> To: "Vladimir I. Umnov" Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Vladimir I. Umnov wrote: >>Also, doing a dd from 4 drives maxes out my read speed as per mdstat >>at 160MB/s (How? PCI is 133MB/s and according to lspci all my >>controllers are on the same bus). Does vmstat lie? > > NO! PCI 2.3 can about 512 MB/s Ok then. Umm so for a 32 bit bus at 33Mhz I'm maxing out my PCI bandwidth. An Asus A7V600 motherboard does not do PCI 2.3