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From: "Georg Schönberger" <g.schoenberger@xortex.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>, XFS mailing list <xfs@oss.sgi.com>,
	Linux Block mailing list <linux-block@vger.kernel.org>,
	Jeff Moyer <jmoyer@redhat.com>,
	Linux FS-Devel <linux-fsdevel@vger.kernel.org>
Subject: Re: XFS and nobarrier with SSDs
Date: Mon, 14 Dec 2015 10:34:30 +0000	[thread overview]
Message-ID: <566E9B36.9080509@xortex.com> (raw)
In-Reply-To: <20151214102750.GA29192@infradead.org>

On 2015-12-14 11:27, Christoph Hellwig wrote:
> 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.
OK, thanks for clarification.
Should the XFS FAQ be updated?
*http://xfs.org/index.php/XFS_FAQ#Q._Should_barriers_be_enabled_with_storage_which_has_a_persistent_write_cache.3F
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WARNING: multiple messages have this Message-ID (diff)
From: "Georg Schönberger" <g.schoenberger@xortex.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Martin Steigerwald <martin@lichtvoll.de>,
	Jens Axboe <axboe@kernel.dk>,
	Linux FS-Devel <linux-fsdevel@vger.kernel.org>,
	Jeff Moyer <jmoyer@redhat.com>,
	Linux Block mailing list <linux-block@vger.kernel.org>,
	XFS mailing list <xfs@oss.sgi.com>
Subject: Re: XFS and nobarrier with SSDs
Date: Mon, 14 Dec 2015 10:34:30 +0000	[thread overview]
Message-ID: <566E9B36.9080509@xortex.com> (raw)
In-Reply-To: <20151214102750.GA29192@infradead.org>

On 2015-12-14 11:27, Christoph Hellwig wrote:
> 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.
OK, thanks for clarification.
Should the XFS FAQ be updated?
*http://xfs.org/index.php/XFS_FAQ#Q._Should_barriers_be_enabled_with_storage_which_has_a_persistent_write_cache.3F

  reply	other threads:[~2015-12-14 10:34 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-12 10:24 XFS and nobarrier with SSDs Georg Schönberger
2015-12-12 12:26 ` Martin Steigerwald
2015-12-14  6:43   ` Georg Schönberger
2015-12-14  8:38     ` Martin Steigerwald
2015-12-14  8:38       ` Martin Steigerwald
2015-12-14  9:58       ` Christoph Hellwig
2015-12-14  9:58         ` Christoph Hellwig
2015-12-14 10:18         ` Georg Schönberger
2015-12-14 10:18           ` Georg Schönberger
2015-12-14 10:27           ` Christoph Hellwig
2015-12-14 10:27             ` Christoph Hellwig
2015-12-14 10:34             ` Georg Schönberger [this message]
2015-12-14 10:34               ` Georg Schönberger
2015-12-14 13:36               ` Christoph Hellwig
2015-12-14 16:39               ` Eric Sandeen
2015-12-26 23:44             ` Linda Walsh
2015-12-26 23:44               ` Linda Walsh
2015-12-14 11:48 ` Emmanuel Florac

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