linux-kernel - Re: Why is O_DSYNC on linux so slow / what's wrong with my SSD?

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Message-ID: <20131120125446.GA6284@infradead.org>
Date:	Wed, 20 Nov 2013 04:54:46 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
Cc:	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	LKML <linux-kernel@...r.kernel.org>, matthew@....cx
Subject: Re: Why is O_DSYNC on linux so slow / what's wrong with my SSD?

On Wed, Nov 20, 2013 at 01:12:43PM +0100, Stefan Priebe - Profihost AG wrote:
> Can anyone explain to me why O_DSYNC for my app on linux is so slow?

Because FreeBSD ignores O_DSYNC on block devices, it never sends a FLUSH
to the device.

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