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Re: XFS and nobarrier with SSDs

To: Georg Sch?nberger <g.schoenberger@xxxxxxxxxx>
Subject: Re: XFS and nobarrier with SSDs
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 14 Dec 2015 02:27:50 -0800
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, Martin Steigerwald <martin@xxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Linux FS-Devel <linux-fsdevel@xxxxxxxxxxxxxxx>, Jeff Moyer <jmoyer@xxxxxxxxxx>, Linux Block mailing list <linux-block@xxxxxxxxxxxxxxx>, XFS mailing list <xfs@xxxxxxxxxxx>
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In-reply-to: <566E978E.2070502@xxxxxxxxxx>
References: <E127700EFE58FD45BD6298EAC813FA42020D8173@xxxxxxxxxxxxxxxxxxxxxx> <3496214.YTSKClH6pV@merkaba> <566E6524.6070401@xxxxxxxxxx> <3911767.qVqsL1TcMv@merkaba> <20151214095823.GA30662@xxxxxxxxxxxxx> <566E978E.2070502@xxxxxxxxxx>
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On Mon, Dec 14, 2015 at 10:18:54AM +0000, Georg Sch?nberger wrote:
> > Or to phrase it
> > differently:  If nobarrier makes a difference skipping it is not safe.
> I do not fully understand that sentence, what do you mean by "makes a 
> difference" and "skipping is not safe"?

The rule of thumb is: if nobarrier makes your workload run faster you
should not be using it, aka: don't use it. 

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