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From: Christoph Hellwig <hch@lst.de>
To: Avi Kivity <avi@scylladb.com>
Cc: Christoph Hellwig <hch@lst.de>,
	linux-xfs@vger.kernel.org, michaelcallahan@fb.com
Subject: Re: discard improvements
Date: Sun, 6 Nov 2016 17:36:42 +0100	[thread overview]
Message-ID: <20161106163642.GB15675@lst.de> (raw)
In-Reply-To: <5a50a07c-369d-1a41-2111-f9ee91ac7425@scylladb.com>

On Sat, Nov 05, 2016 at 08:18:05PM +0200, Avi Kivity wrote:
> The big problem with "it depends" is that usually the information it 
> depends on is not available, so the application has to rely on a human to 
> guess correctly.  With the trend for machines to be managed by machines, 
> it's really hard to get optimal performance.  So exposure of any 
> information that can help to make a decision, including that the kernel can 
> make good use of TRIM, will be very helpful.

I agree with you, but until devices tell us that their discard
implementation sucks on their own there is not much I can help
you there.

  reply	other threads:[~2016-11-06 16:36 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-17 20:22 discard improvements Christoph Hellwig
2016-10-17 20:22 ` [PATCH 1/3] xfs: fix the AG loop in xfs_alloc_vextent for busy extents Christoph Hellwig
2016-10-19 13:48   ` Brian Foster
2016-10-21 12:48     ` Christoph Hellwig
2016-10-21 14:41       ` Brian Foster
2016-11-08  6:15   ` Dave Chinner
2016-11-10 19:17     ` Christoph Hellwig
2016-10-17 20:22 ` [PATCH 2/3] xfs: don't block the log commit handler for discards Christoph Hellwig
2016-10-17 23:29   ` Dave Chinner
2016-10-18  5:05     ` Christoph Hellwig
2016-10-19 10:58     ` Christoph Hellwig
2016-10-28 16:16       ` Michael Callahan
2016-10-31 15:16         ` Christoph Hellwig
2016-10-17 20:22 ` [PATCH 3/3] xfs: merge discard requests Christoph Hellwig
2016-10-28 10:11 ` discard improvements Avi Kivity
2016-10-31 15:14   ` Christoph Hellwig
2016-11-05 18:18     ` Avi Kivity
2016-11-06 16:36       ` Christoph Hellwig [this message]
2016-11-06 23:21         ` Dave Chinner

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