From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>,
Chris Mason <chris.mason@oracle.com>,
Dave Chinner <david@fromorbit.com>, Jan Kara <jack@suse.cz>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jens Axboe <axboe@kernel.dk>, Mel Gorman <mel@csn.ul.ie>,
Rik van Riel <riel@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Christoph Hellwig <hch@lst.de>, linux-mm <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 01/13] writeback: IO-less balance_dirty_pages()
Date: Wed, 17 Nov 2010 12:19:26 +0800 [thread overview]
Message-ID: <20101117041926.GA14209@localhost> (raw)
In-Reply-To: <20101117035905.525232375@intel.com>
> BEHAVIOR CHANGE
> ===============
>
> Users will notice that the applications will get throttled once the
> crossing the global (background + dirty)/2=15% threshold. For a single
> "cp", it could be soft throttled at 2*bdi->write_bandwidth around 15%
s/2/8/
Sorry, the initial soft throttle bandwidth for "cp" is about 8 times
of bdi bandwidth when reaching 15% dirty pages.
> dirty pages, and be balanced at speed bdi->write_bandwidth around 17.5%
> dirty pages. Before patch, the behavior is to just throttle it at 17.5%
> dirty pages.
>
> Since the task will be soft throttled earlier than before, it may be
> perceived by end users as performance "slow down" if his application
> happens to dirty more than ~15% memory.
WARNING: multiple messages have this Message-ID (diff)
From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>,
Chris Mason <chris.mason@oracle.com>,
Dave Chinner <david@fromorbit.com>, Jan Kara <jack@suse.cz>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jens Axboe <axboe@kernel.dk>, Mel Gorman <mel@csn.ul.ie>,
Rik van Riel <riel@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Christoph Hellwig <hch@lst.de>, linux-mm <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 01/13] writeback: IO-less balance_dirty_pages()
Date: Wed, 17 Nov 2010 12:19:26 +0800 [thread overview]
Message-ID: <20101117041926.GA14209@localhost> (raw)
In-Reply-To: <20101117035905.525232375@intel.com>
> BEHAVIOR CHANGE
> ===============
>
> Users will notice that the applications will get throttled once the
> crossing the global (background + dirty)/2=15% threshold. For a single
> "cp", it could be soft throttled at 2*bdi->write_bandwidth around 15%
s/2/8/
Sorry, the initial soft throttle bandwidth for "cp" is about 8 times
of bdi bandwidth when reaching 15% dirty pages.
> dirty pages, and be balanced at speed bdi->write_bandwidth around 17.5%
> dirty pages. Before patch, the behavior is to just throttle it at 17.5%
> dirty pages.
>
> Since the task will be soft throttled earlier than before, it may be
> perceived by end users as performance "slow down" if his application
> happens to dirty more than ~15% memory.
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next prev parent reply other threads:[~2010-11-17 4:19 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-17 3:58 [PATCH 01/13] writeback: IO-less balance_dirty_pages() Wu Fengguang
2010-11-17 3:58 ` Wu Fengguang
2010-11-17 3:58 ` Wu Fengguang
2010-11-17 4:19 ` Wu Fengguang [this message]
2010-11-17 4:19 ` Wu Fengguang
2010-11-17 8:33 ` Wu Fengguang
2010-11-17 8:33 ` Wu Fengguang
2010-11-17 4:30 ` Wu Fengguang
2010-11-17 4:30 ` Wu Fengguang
-- strict thread matches above, loose matches on Subject: below --
2010-11-17 4:27 [PATCH 00/13] IO-less dirty throttling v2 Wu Fengguang
2010-11-17 4:27 ` [PATCH 01/13] writeback: IO-less balance_dirty_pages() Wu Fengguang
2010-11-17 4:27 ` Wu Fengguang
2010-11-17 4:27 ` Wu Fengguang
2010-11-17 10:34 ` Minchan Kim
2010-11-17 10:34 ` Minchan Kim
2010-11-22 2:01 ` Wu Fengguang
2010-11-22 2:01 ` Wu Fengguang
2010-11-22 2:01 ` Wu Fengguang
2010-11-17 23:08 ` Andrew Morton
2010-11-17 23:08 ` Andrew Morton
2010-11-17 23:08 ` Andrew Morton
2010-11-18 13:04 ` Peter Zijlstra
2010-11-18 13:04 ` Peter Zijlstra
2010-11-18 13:26 ` Wu Fengguang
2010-11-18 13:26 ` Wu Fengguang
2010-11-18 13:40 ` Peter Zijlstra
2010-11-18 13:40 ` Peter Zijlstra
2010-11-18 14:02 ` Wu Fengguang
2010-11-18 14:02 ` Wu Fengguang
[not found] ` <20101129151719.GA30590@localhost>
[not found] ` <1291064013.32004.393.camel@laptop>
[not found] ` <20101130043735.GA22947@localhost>
[not found] ` <1291156522.32004.1359.camel@laptop>
[not found] ` <1291156765.32004.1365.camel@laptop>
[not found] ` <20101201133818.GA13377@localhost>
2010-12-01 23:03 ` Andrew Morton
2010-12-01 23:03 ` Andrew Morton
2010-12-02 1:56 ` Wu Fengguang
2010-12-02 1:56 ` Wu Fengguang
2010-12-05 16:14 ` Wu Fengguang
2010-12-06 2:42 ` Ted Ts'o
2010-12-06 2:42 ` Ted Ts'o
2010-12-06 9:52 ` Dmitry
2010-12-06 9:52 ` Dmitry
2010-12-06 9:52 ` Dmitry
2010-12-06 12:34 ` Ted Ts'o
2010-12-06 12:34 ` Ted Ts'o
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