From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: RAID performance - new kernel results Date: Tue, 16 Apr 2013 16:43:01 -0500 Message-ID: <516DC5E5.4080401@hardwarefreak.com> References: <20372204.0.1366140527266.JavaMail.root@zimbra> Reply-To: stan@hardwarefreak.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20372204.0.1366140527266.JavaMail.root@zimbra> Sender: linux-raid-owner@vger.kernel.org To: Roy Sigurd Karlsbakk Cc: Phil Turmel , linux-raid@vger.kernel.org, Adam Goryachev List-Id: linux-raid.ids On 4/16/2013 2:28 PM, Roy Sigurd Karlsbakk wrote: > Switches (unlike bridges) do not use store-and-forward. They use cut-through... This is incorrect Roy. The default forwarding mode of all IEEE 802.3 compliant switches is store and forward. All unmanaged switches use this forwarding mode. Cut-through is an optimization and is optional only on managed switches. And these aren't the only two forwarding modes in managed switches today. Switch routers do layer 3 as well as 2 forwarding, and switches offering VLANs, QOS, and other features use different forwarding methods still. But TTBOMK, all vendors' managed switches default to store and forward, as that is the IEEE 802.3 standard. -- Stan