linux-kernel - Re: [PATCH] block: remove artifical max_hw

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Message-ID: <20141001211258.GB24820@infradead.org>
Date:	Wed, 1 Oct 2014 14:12:58 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"Elliott, Robert (Server Storage)" <Elliott@...com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH] block: remove artifical max_hw_sectors cap

On Wed, Oct 01, 2014 at 06:59:34PM +0000, Elliott, Robert (Server Storage) wrote:
> One supporting example: A low limit interferes with creation of
> full stripe writes for RAID controllers.

Yes, both Linux mdraid and parity raids are often crippled by the
default.  The mdadm default of 512kb for each chunk combined with
the default limit very much guarantees a horrible out of the box
experience.
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