From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carson Gaspar Subject: Re: [DRBD-user] kvm, drbd, elevator, rotational - quite an interesting co-operation Date: Mon, 06 Jul 2009 13:00:32 -0700 Message-ID: <4A5257E0.2040200@taltos.org> References: <4A4D1099.8050709@msgid.tls.msk.ru> <90eb1dc70907021314p140faa87he9c583cca1b391ea@mail.gmail.com> <4A51FC17.8020004@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: KVM list To: drbd-user@lists.linbit.com Return-path: Received: from mail.taltos.org ([64.81.242.52]:41454 "EHLO gandalf.taltos.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753579AbZGFUXu (ORCPT ); Mon, 6 Jul 2009 16:23:50 -0400 In-Reply-To: <4A51FC17.8020004@msgid.tls.msk.ru> Sender: kvm-owner@vger.kernel.org List-ID: Michael Tokarev wrote: > To be fair, I can't construct an example when deeper queue may > be bad (not counting bad NCQ implementations). Increased latency for new requests. Larger queue depths improve throughput at the expense of latency. -- Carson