linux-kernel - Re: [PATCH 4/5] brd: Request from fdisk 4k alignment

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Message-ID: <yq1k339enl5.fsf@sermon.lab.mkp.net>
Date:	Wed, 05 Nov 2014 09:20:06 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Jens Axboe <axboe@...com>, Matthew Wilcox <willy@...ux.intel.com>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 4/5] brd: Request from fdisk 4k alignment

>>>>> "Boaz" == Boaz Harrosh <boaz@...xistor.com> writes:

Hey Boaz,

Boaz> Note that blk_queue_physical_block_size() also trashes io_min, but
Boaz> we can leave this one to be 512. io_min as opposed to
Boaz> physical_block_size will actually change Kernel behavior

Care to elaborate?

Also, fdisk and parted should be aligning on 1MB by default regardless
of block size. So I'm also not sure why you need to trick fdisk to align
by setting the pbs.

-- 
Martin K. Petersen	Oracle Linux Engineering
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