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

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Message-ID: <5446BBD2.8040306@kernel.dk>
Date:	Tue, 21 Oct 2014 14:02:26 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>,
	"Elliott, Robert (Server Storage)" <Elliott@...com>
CC:	"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 10/17/2014 07:12 AM, Christoph Hellwig wrote:
> On Wed, Oct 01, 2014 at 02:12:58PM -0700, Christoph Hellwig wrote:
>> 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.
> 
> Jens, can you apply this patch once the 3.19 queue opens?

Yup, lets get it applied.

-- 
Jens Axboe

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