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From: Jan Engelhardt <jengelh@linux01.gwdg.de>
To: Kyle Moffett <mrmacman_g4@mac.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Sam Ravnborg <sam@ravnborg.org>, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH 07/16] kconfig-dynamic-frequency.diff
Date: Sun, 1 Apr 2007 21:01:06 +0200 (MEST)	[thread overview]
Message-ID: <Pine.LNX.4.61.0704012058060.16977@yvahk01.tjqt.qr> (raw)
In-Reply-To: <2E204ACD-E697-42C6-8F01-22C1B7B4A85B@mac.com>


On Apr 1 2007 14:52, Kyle Moffett wrote:
>
> On Apr 01, 2007, at 14:42:59, Jan Engelhardt wrote:
>> But I would have to ask: Why do we need 100/250/300/1000 if there
>> is anyway an input field for the user to enter - s/he should read
>> the help text for Known Good values, should not s/he?
>
> Actually, probably what should be done is make the "HZ_CUSTOM"
> option depend on EXPERIMENTAL / EMBEDDED / "EXPERT" /
> "I_KNOW_WHAT_THE_HELL_IM_DOING" or some other equivalent option,

EXPERIMENTAL is most often enabled by distributors.
And we are still missing our much-needed CONFIG_EXPERT :-(

> because a wrong choice for HZ has the potential to really screw up
> a system.  For example, 10000+ would make most systems spend a
> significant portion of their time processing timer interrupts and

Point taken. Ehm, I already once tried making a 10000-Hz kernel
around 2.6.13-15 or so. It did not compile because some header files had
#error directives for HZ >= 1536. (jiffies.h:33 if you want
to know.) IIRC there also was another place somewhere in networking
code that #errors out at >8192.


Jan
-- 

  reply	other threads:[~2007-04-01 19:03 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-01 18:13 [PATCH 0/16] Assorted patches Jan Engelhardt
2007-04-01 18:13 ` [PATCH 1/16] vt-sysfs-for-colors.diff Jan Engelhardt
2007-04-02  6:49   ` Antonino A. Daplas
2007-04-02  7:31     ` [PATCH 17/16] Do not reset UTF8 on terminal reset Jan Engelhardt
2007-04-02  9:30       ` Antonino A. Daplas
2007-04-02 11:26       ` Paul LeoNerd Evans
2007-04-02 11:44         ` Antonino A. Daplas
2007-04-02 11:54           ` Paul LeoNerd Evans
2007-04-02 12:47             ` Antonino A. Daplas
2007-04-02 13:20               ` Paul LeoNerd Evans
2007-04-02 13:34               ` Jan Engelhardt
2007-04-02 18:50       ` Pavel Machek
2007-04-01 18:14 ` [PATCH 2/16] vt-pure-colors.diff Jan Engelhardt
2007-04-01 18:39   ` James Bruce
2007-04-02  6:49   ` Antonino A. Daplas
2007-04-02  7:04     ` Jan Engelhardt
2007-04-02  7:50       ` Antonino A. Daplas
2007-04-02  8:01         ` Jan Engelhardt
2007-04-01 18:14 ` [PATCH 3/16] vt-underline-color.diff Jan Engelhardt
2007-04-02  5:37   ` Andrew Morton
2007-04-02  6:57   ` Antonino A. Daplas
2007-04-01 18:14 ` [PATCH 4/16] vt-printk-color.diff Jan Engelhardt
2007-04-01 18:14 ` [PATCH 5/16] fix-kthread-niceness.diff Jan Engelhardt
2007-04-02  5:39   ` Andrew Morton
2007-04-01 18:15 ` [PATCH 06/16] isofs-add-write-bit.diff Jan Engelhardt
2007-04-01 18:15 ` [PATCH 07/16] kconfig-dynamic-frequency.diff Jan Engelhardt
2007-04-01 18:39   ` Kyle Moffett
2007-04-01 18:42     ` Jan Engelhardt
2007-04-01 18:52       ` Kyle Moffett
2007-04-01 19:01         ` Jan Engelhardt [this message]
2007-04-01 19:42           ` [PATCH] Kyle Moffett
2007-04-01 19:47             ` [PATCH] Jan Engelhardt
2007-04-01 20:07               ` [PATCH] Kyle Moffett
2007-04-01 19:50             ` [PATCH] Add a CONFIG_I_KNOW_WHAT_THE_HELL_I_AM_DOING variable Kyle Moffett
2007-04-01 23:03             ` [PATCH] Andi Kleen
2007-04-01 20:22         ` [PATCH 07/16] kconfig-dynamic-frequency.diff Robert P. J. Day
2007-04-01 18:15 ` [PATCH 08/16] console-printk-level.diff Jan Engelhardt
2007-04-01 19:07   ` Randy Dunlap
2007-04-01 18:15 ` [PATCH 09/16] zlib-decompression-status.diff Jan Engelhardt
2007-04-02 17:48   ` Jörn Engel
2007-04-02 18:50     ` Jan Engelhardt
2007-04-01 18:15 ` [PATCH 10/16] show-partitions-on-mount-error.diff Jan Engelhardt
2007-04-02  5:47   ` Andrew Morton
2007-04-02  5:48   ` Andrew Morton
2007-04-02  7:01     ` [PATCH 10/16] show partitions on mount error Jan Engelhardt
2007-04-02 18:59   ` [PATCH 10/16] show-partitions-on-mount-error.diff Pavel Machek
2007-04-04  0:42     ` Jan Engelhardt
2007-04-01 18:16 ` [PATCH 11/16] samba-eintr-fix.diff Jan Engelhardt
2007-04-01 19:09   ` Dave Jones
2007-04-01 19:28     ` Jan Engelhardt
2007-04-01 19:42       ` Dave Jones
2007-04-02  5:53   ` Andrew Morton
2007-04-01 18:16 ` [PATCH 12/16] cifs-use-mutex.diff Jan Engelhardt
2007-04-02  5:36   ` Roland Dreier
2007-04-01 18:17 ` [PATCH 13/16] show-pipesize-in-stat.diff Jan Engelhardt
2007-04-02  5:58   ` Andrew Morton
2007-04-02  6:48     ` Jan Engelhardt
2007-04-02 10:41   ` Eric Dumazet
2007-04-04  0:48     ` Jan Engelhardt
2007-04-04  5:03       ` Eric Dumazet
2007-04-17  8:05         ` Jan Engelhardt
2007-04-01 18:17 ` [PATCH 14/16] kconfig-allow-override.diff Jan Engelhardt
2007-04-01 18:44   ` Sam Ravnborg
2007-04-01 19:09     ` Randy Dunlap
2007-04-01 18:18 ` [PATCH 15/16] use-regular-eth-suffix.diff Jan Engelhardt
2007-04-01 18:42   ` Kyle Moffett
2007-04-02  1:40   ` Jouni Malinen
2007-04-01 18:18 ` [PATCH 16/16] warn-on-kthread-name-truncation.diff Jan Engelhardt
2007-04-02  6:00   ` Andrew Morton
2007-04-02  6:51     ` Jan Engelhardt

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