From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon, 14 Nov 2016 16:17:37 +0100
Subject: [lustre-devel] [PATCH v4] staging: lustre: mdc: manage number
 of modify RPCs in flight
In-Reply-To: <1478793073-21814-1-git-send-email-jsimmons@infradead.org>
References: <1478793073-21814-1-git-send-email-jsimmons@infradead.org>
Message-ID: <20161114151737.GA18183@kroah.com>
List-Id: <lustre-devel-lustre.org>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: James Simmons <jsimmons@infradead.org>
Cc: devel@driverdev.osuosl.org, Andreas Dilger <andreas.dilger@intel.com>, Oleg Drokin <oleg.drokin@intel.com>, Gregoire Pichon <gregoire.pichon@bull.net>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Lustre Development List <lustre-devel@lists.lustre.org>

On Thu, Nov 10, 2016 at 10:51:13AM -0500, James Simmons wrote:
> From: Gregoire Pichon <gregoire.pichon@bull.net>
> 
> This patch is the main client part of a new feature that supports
> multiple modify metadata RPCs in parallel. Its goal is to improve
> metadata operations performance of a single client, while maintening
> the consistency of MDT reply reconstruction and MDT recovery
> mechanisms.
> 
> It allows to manage the number of modify RPCs in flight within
> the client obd structure and to assign a virtual index (the tag) to
> each modify RPC to help server side cleaning of reply data.
> 
> The mdc component uses this feature to send multiple modify RPCs
> in parallel.

Is this a new feature?  Why should we take this now and not just wait
until the code is out of staging?

thanks,

greg k-h