From: Dave Chinner <david@fromorbit.com>
To: Stefan Ring <stefanrin@gmail.com>
Cc: Nathan Scott <nathans@redhat.com>, Mark Seger <mjseger@gmail.com>,
Linux fs XFS <xfs@oss.sgi.com>
Subject: Re: definitions for /proc/fs/xfs/stat
Date: Tue, 18 Jun 2013 10:15:40 +1000 [thread overview]
Message-ID: <20130618001540.GL29376@dastard> (raw)
In-Reply-To: <CAAxjCEwhwqFhPbJsJGYUCqwF5qc7iZpNJpELOkR-9NNuPzFxBw@mail.gmail.com>
On Mon, Jun 17, 2013 at 10:28:19PM +0200, Stefan Ring wrote:
> > I asked around and people believe the cache is on the order of a few GB and
> > the test ran I was intentionally large enough to overshadow any cache
> > effects, running for about a minute and doing 100K 1K file creates. The
> > disk write data was close to a sustained 475MB/sec and would have easily
> > filled the cache in the first handful of seconds which would have produced
> > enough backpressure to slow down the write rate which it never did.
>
> If a limited number of blocks gets written over and over, you won't
> ever fill the cache.
Right, and the XFS log is circular and about 1GB in size on the
filesystem under test, so should fit completely in cache. Hence
speeds faster than a physical disk are acheivable if the log stays
resident in the cache....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2013-06-18 0:15 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-14 16:37 definitions for /proc/fs/xfs/stat Mark Seger
2013-06-14 22:16 ` Nathan Scott
2013-06-14 22:37 ` Mark Seger
2013-06-15 0:17 ` Nathan Scott
2013-06-15 1:55 ` Mark Seger
2013-06-15 2:04 ` Dave Chinner
2013-06-15 10:35 ` Mark Seger
2013-06-15 16:22 ` Mark Seger
2013-06-16 0:11 ` Dave Chinner
2013-06-16 12:58 ` Mark Seger
2013-06-16 22:06 ` Dave Chinner
2013-06-16 22:31 ` Mark Seger
2013-06-16 23:14 ` Dave Chinner
2013-06-16 23:31 ` Mark Seger
2013-06-17 1:11 ` Nathan Scott
2013-06-17 2:46 ` Dave Chinner
2013-06-17 5:41 ` Nathan Scott
2013-06-17 10:57 ` Mark Seger
2013-06-17 11:13 ` Dave Chinner
2013-06-17 14:57 ` Mark Seger
2013-06-17 20:28 ` Stefan Ring
2013-06-18 0:15 ` Dave Chinner [this message]
2013-06-18 10:17 ` Mark Seger
2013-06-19 23:02 ` Useful stats (was Re: definitions for /proc/fs/xfs/stat) Nathan Scott
2013-06-17 11:19 ` definitions for /proc/fs/xfs/stat Dave Chinner
2013-06-17 13:18 ` Stan Hoeppner
2013-06-18 0:13 ` Mark Goodwin
2013-06-16 0:00 ` Dave Chinner
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