From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sumit Saxena Subject: RE: [PATCH 09/15] megaraid_sas: Dual Queue depth support Date: Wed, 27 Jan 2016 12:39:40 +0530 Message-ID: <621bde6eaedf5577d81013b828222cb9@mail.gmail.com> References: <1450445228-26571-1-git-send-email-Sumit.Saxena@avagotech.com> <1450445228-26571-10-git-send-email-Sumit.Saxena@avagotech.com> <569E3B51.9070103@redhat.com> <54361777a29aaf5a2c81a5456da0de50@mail.gmail.com> <569F91D3.6020309@redhat.com> <569F96A5.3080001@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: Received: from mail-lb0-f181.google.com ([209.85.217.181]:35302 "EHLO mail-lb0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751046AbcA0HJn (ORCPT ); Wed, 27 Jan 2016 02:09:43 -0500 Received: by mail-lb0-f181.google.com with SMTP id bc4so105340779lbc.2 for ; Tue, 26 Jan 2016 23:09:42 -0800 (PST) In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Martin K. Petersen" , Tomas Henzl Cc: jbottomley@parallels.com, hch@infradead.org, linux-scsi@vger.kernel.org, Kashyap Desai > -----Original Message----- > From: Martin K. Petersen [mailto:martin.petersen@oracle.com] > Sent: Wednesday, January 27, 2016 7:32 AM > To: Tomas Henzl > Cc: Sumit Saxena; jbottomley@parallels.com; hch@infradead.org; > martin.petersen@oracle.com; linux-scsi@vger.kernel.org; Kashyap Desai > Subject: Re: [PATCH 09/15] megaraid_sas: Dual Queue depth support > > >>>>> "Tomas" == Tomas Henzl writes: > > >> Yes this is already covered internally, there would be perf penalty > >> with VDs in configuration but this feature will be turned on based on > >> firmware settings and that specific firmware deployment has primary > >> purpose of increasing JBOD performance. This focuses on firmware > >> deployment with less VDs(or no) and more JBODs in configuration. > > Tomas> OK, so it is switched off by default in the firmware and the user > Tomas> and an educated user can switch it on ? if so, it's fine for me. > > Sumit? Yes, this feature will be enabled for specific firmware only. On rest of firmware types, it will be disabled(not supported). Thanks, Sumit > > -- > Martin K. Petersen Oracle Linux Engineering