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From: Ted Ts'o <tytso@mit.edu>
To: Tao Ma <tm@tao.ma>
Cc: linux-ext4@vger.kernel.org, Jan Kara <jack@suse.cz>
Subject: Re: [PATCH] jbd2: Use WRITE_SYNC in journal checkpoint.
Date: Mon, 27 Jun 2011 12:41:58 -0400	[thread overview]
Message-ID: <20110627164158.GD2729@thunk.org> (raw)
In-Reply-To: <1307418559-3329-1-git-send-email-tm@tao.ma>

On Tue, Jun 07, 2011 at 11:49:19AM +0800, Tao Ma wrote:
> From: Tao Ma <boyu.mt@taobao.com>
> 
> In journal checkpoint, we write the buffer and wait for its finish.
> But in cfq, the async queue has a very low priority, and in our test,
> if there are too many sync queues and every queue is filled up with
> requests, the write request will be delayed for quite a long time and
> all the tasks which are waiting for journal space will end with errors like:

Thanks, added to the ext4 patch tree.

					- Ted

      parent reply	other threads:[~2011-06-27 16:42 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-07  3:49 [PATCH] jbd2: Use WRITE_SYNC in journal checkpoint Tao Ma
2011-06-14 15:22 ` Tao Ma
2011-06-27 16:41 ` Ted Ts'o [this message]

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