From: Lee Revell <rlrevell@joe-job.com>
To: Wu Fengguang <wfg@mail.ustc.edu.cn>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Con Kolivas <kernel@kolivas.org>
Subject: Re: [PATCH 07/23] readahead: insert cond_resched() calls
Date: Sat, 18 Mar 2006 22:50:42 -0500 [thread overview]
Message-ID: <1142740242.4532.1.camel@mindpipe> (raw)
In-Reply-To: <20060319023451.808130000@localhost.localdomain>
On Sun, 2006-03-19 at 10:34 +0800, Wu Fengguang wrote:
> plain text document attachment
> (readahead-insert-cond_resched-calls.patch)
> Since the VM_MAX_READAHEAD is greatly enlarged and the algorithm become more
> complex, it becomes necessary to insert some cond_resched() calls in the
> read-ahead path.
>
> If desktop users still feel audio jitters with the new read-ahead code,
> please try one of the following ways to get rid of it:
>
> 1) compile kernel with CONFIG_PREEMPT_VOLUNTARY/CONFIG_PREEMPT
> 2) reduce the read-ahead request size by running
> blockdev --setra 256 /dev/hda # or whatever device you are using
Do you have any numbers on this (say, from Ingo's latency tracer)? Have
you confirmed it's not a latency regression with the default settings?
Lee
next prev parent reply other threads:[~2006-03-19 3:50 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-19 2:34 [PATCH 00/23] Adaptive read-ahead V11 Wu Fengguang
2006-03-19 2:34 ` [PATCH 01/23] readahead: kconfig options Wu Fengguang
2006-03-19 2:34 ` [PATCH 02/23] radixtree: look-aside cache Wu Fengguang
2006-03-20 16:01 ` Christoph Lameter
2006-03-21 2:19 ` Wu Fengguang
2006-03-19 2:34 ` [PATCH 03/23] radixtree: hole scanning functions Wu Fengguang
2006-03-19 2:34 ` [PATCH 04/23] readahead: page flag PG_readahead Wu Fengguang
2006-03-19 2:34 ` [PATCH 05/23] readahead: refactor do_generic_mapping_read() Wu Fengguang
2006-03-19 2:34 ` [PATCH 06/23] readahead: refactor __do_page_cache_readahead() Wu Fengguang
2006-03-19 2:34 ` [PATCH 07/23] readahead: insert cond_resched() calls Wu Fengguang
2006-03-19 3:50 ` Lee Revell [this message]
2006-03-19 5:32 ` Wu Fengguang
2006-03-20 13:31 ` Wu Fengguang
2006-03-19 2:34 ` [PATCH 08/23] readahead: common macros Wu Fengguang
2006-03-19 2:34 ` [PATCH 09/23] readahead: events accounting Wu Fengguang
2006-03-19 2:34 ` [PATCH 10/23] readahead: support functions Wu Fengguang
2006-03-19 2:34 ` [PATCH 11/23] readahead: sysctl parameters Wu Fengguang
2006-03-19 2:34 ` [PATCH 12/23] readahead: min/max sizes Wu Fengguang
2006-03-19 2:34 ` [PATCH 13/23] readahead: page cache aging accounting Wu Fengguang
2006-03-19 2:34 ` [PATCH 14/23] readahead: state based method Wu Fengguang
2006-03-19 2:34 ` [PATCH 15/23] readahead: context " Wu Fengguang
2006-03-19 2:34 ` [PATCH 16/23] readahead: other methods Wu Fengguang
2006-03-19 2:34 ` [PATCH 17/23] readahead: call scheme Wu Fengguang
2006-03-19 2:34 ` [PATCH 18/23] readahead: laptop mode Wu Fengguang
2006-03-19 2:34 ` [PATCH 19/23] readahead: loop case Wu Fengguang
2006-03-19 2:34 ` [PATCH 20/23] readahead: nfsd case Wu Fengguang
2006-03-19 2:34 ` [PATCH 21/23] readahead: debug radix tree new functions Wu Fengguang
2006-03-19 2:34 ` [PATCH 22/23] readahead: debug traces showing accessed file names Wu Fengguang
2006-03-19 2:34 ` [PATCH 23/23] readahead: debug traces showing read patterns Wu Fengguang
2006-03-19 3:10 ` [PATCH 00/23] Adaptive read-ahead V11 Jon Smirl
2006-03-19 3:47 ` Wu Fengguang
2006-03-19 4:10 ` Jon Smirl
2006-03-19 5:09 ` Wu Fengguang
2006-03-19 15:53 ` Jon Smirl
2006-03-20 13:54 ` Wu Fengguang
2006-03-27 21:38 ` Matt Heler
2006-03-28 3:44 ` Wu Fengguang
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