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From: "Ted Ts'o" <tytso@mit.edu>
To: Anton Blanchard <anton@samba.org>
Cc: adilger.kernel@dilger.ca, eric.dumazet@gmail.com, tj@kernel.org,
	linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] percpu_counter: Put a reasonable upper bound on percpu_counter_batch
Date: Mon, 29 Aug 2011 09:27:34 -0400	[thread overview]
Message-ID: <20110829132734.GB12187@thunk.org> (raw)
In-Reply-To: <A91A91A5-9EF0-42FE-B1C3-184D65112EA9@mit.edu>

On Fri, Aug 26, 2011 at 07:48:52AM -0400, Theodore Tso wrote:
> 
> I understand why we would want to reduce this number.   Unfortunately, the
> question is what do we do if all 1024 threads try to do buffered writes into
> the file system at the same instant, when we have less than 4 megabytes
> of space left?

Oops, sorry, that should be 4 GB of space left (i.e., what do we do if
all 1024 cpu's all try write 1024 4k blocks all at the same time).
Imagine an simulation application where all threads finish at more or
less the same time and then try to write out their data files at the
same time....

							- Ted

      parent reply	other threads:[~2011-08-29 13:27 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-25 21:26 [PATCH 1/2] ext4: EXT4_FREEBLOCKS_WATERMARK is overly pessimistic Anton Blanchard
2011-08-25 21:29 ` [PATCH 2/2] percpu_counter: Put a reasonable upper bound on percpu_counter_batch Anton Blanchard
2011-08-26  8:39   ` Eric Dumazet
2011-08-26  8:39     ` Eric Dumazet
2011-08-29 11:46     ` [PATCH] " Anton Blanchard
2011-09-06  3:48       ` Tejun Heo
2011-09-06 13:30         ` Theodore Tso
2011-09-06 13:30           ` Theodore Tso
2011-09-06 16:44           ` Tejun Heo
2011-09-06 16:44             ` Tejun Heo
2011-09-07 11:08           ` Anton Blanchard
2011-09-07 11:08             ` Anton Blanchard
2011-08-26  9:00   ` [PATCH 2/2] " Tejun Heo
2011-08-26 11:48   ` Theodore Tso
2011-08-29 11:54     ` Anton Blanchard
2011-08-29 11:54       ` Anton Blanchard
2011-08-29 13:27     ` Ted Ts'o [this message]

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