From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Theodore Tso <tytso@mit.edu>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <jens.axboe@oracle.com>,
Dave Chinner <david@fromorbit.com>,
Chris Mason <chris.mason@oracle.com>,
Christoph Hellwig <hch@infradead.org>,
jack@suse.cz, Artem Bityutskiy <dedekind1@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: [RFC][PATCH 5/7] writeback: use 64MB MAX_WRITEBACK_PAGES
Date: Thu, 10 Sep 2009 06:53:18 +0200 [thread overview]
Message-ID: <1252558398.7205.0.camel@laptop> (raw)
In-Reply-To: <20090909232938.GD24951@mit.edu>
On Wed, 2009-09-09 at 19:29 -0400, Theodore Tso wrote:
> On Wed, Sep 09, 2009 at 10:51:46PM +0800, Wu Fengguang wrote:
> > + * The maximum number of pages to writeout in a single periodic/background
> > + * writeback operation. 64MB means I_SYNC may be hold for up to 1 second.
> > + * This is not a big problem since we normally do kind of trylock on I_SYNC
> > + * for non-data-integrity writes. Userspace tasks doing throttled writeback
> > + * do not use this value.
>
> What's your justification for using 64MB? Where are you getting 1
> second from? On a fast RAID array 64MB can be written in much less
> than 1 second.
Worse, on my 5mb/s usb stick writing out 64m will take forever.
next prev parent reply other threads:[~2009-09-10 4:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090909145141.293229693@intel.com>
[not found] ` <20090909150601.159061863@intel.com>
2009-09-09 15:44 ` [RFC][PATCH 7/7] writeback: balance_dirty_pages() shall write more than dirtied pages Jan Kara
2009-09-10 1:42 ` Wu Fengguang
2009-09-10 12:57 ` Chris Mason
2009-09-10 13:21 ` Wu Fengguang
2009-09-10 14:56 ` Peter Zijlstra
2009-09-10 15:14 ` Wu Fengguang
2009-09-10 15:31 ` Peter Zijlstra
2009-09-10 15:41 ` Wu Fengguang
2009-09-10 15:54 ` Peter Zijlstra
2009-09-10 16:08 ` Wu Fengguang
[not found] ` <20090909150600.330539880@intel.com>
2009-09-09 15:45 ` [RFC][PATCH 1/7] writeback: cleanup writeback_single_inode() Jan Kara
[not found] ` <20090909150600.451373732@intel.com>
2009-09-09 15:53 ` [RFC][PATCH 2/7] writeback: fix queue_io() ordering Jan Kara
2009-09-10 1:26 ` Wu Fengguang
2009-09-10 14:14 ` Jan Kara
2009-09-10 14:17 ` Wu Fengguang
[not found] ` <20090909150600.874037375@intel.com>
2009-09-09 23:29 ` [RFC][PATCH 5/7] writeback: use 64MB MAX_WRITEBACK_PAGES Theodore Tso
2009-09-10 0:13 ` Wu Fengguang
2009-09-10 4:53 ` Peter Zijlstra [this message]
2009-09-10 7:35 ` Wu Fengguang
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