linux-kernel - Re: [PATCH v2] staging/lustre: lloop depends on BLOCK

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Date:	Fri, 2 Aug 2013 03:49:30 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"Dilger, Andreas" <andreas.dilger@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Xiong Zhou <jencce.kernel@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peng Tao <bergwolf@...il.com>, Paul Bolle <pebolle@...cali.nl>,
	Jiri Kosina <trivial@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>
Subject: Re: [PATCH v2] staging/lustre: lloop depends on BLOCK

On Thu, Aug 01, 2013 at 07:57:22PM +0000, Dilger, Andreas wrote:
> It provides significant performance improvement for network IO on Lustre.
> It bypasses DLM locking in Lustre and the VFS layer on the client, copying
> in the loop driver, and page-by-page IO submission in the normal IO path.

Part of being upstream is improving existing drivers instead of copy and
pasting them.  Please take a Look at Shaggys in-kernel direct I/O and
loop improvements and submit any incremental improvements ontop of that
one.

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