From: Ingo Molnar <mingo@redhat.com>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: <alan@lxorguk.ukuu.org.uk>, <linux-kernel@vger.kernel.org>,
<macro@ds2.pg.gda.pl>
Subject: Re: [PATCH] 2.4.1-ac UP-APIC updates
Date: Tue, 20 Feb 2001 13:46:18 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.32.0102201343490.7613-100000@devserv.devel.redhat.com> (raw)
In-Reply-To: <200102201811.TAA00748@harpo.it.uu.se>
On Tue, 20 Feb 2001, Mikael Pettersson wrote:
> * NMI rate reduction for UP-APIC: the 100Hz default rate is excessive for
> normal systems, 1Hz suffices. It turns out we cannot start at 1Hz due to
> this interacting badly with check_nmi_watchdog() and the watchdog itself,
> so the rate is reduced after check_nmi_watchdog() is done.
i dont like this one. 100 times a second makes absolutely no performance
difference whatsoever - but eg. i'm driving kernel profiling from the NMI
handler to get profiles of eg. IRQ handlers and other cli()-ed code areas.
another reason is that if NMIs intaract with anything else in the system,
we'll have much better chances to hit it with 100 Hz than with 1 Hz.
Ingo
next prev parent reply other threads:[~2001-02-20 18:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-20 18:11 Mikael Pettersson
2001-02-20 18:46 ` Ingo Molnar [this message]
2001-02-20 20:55 ` Alan Cox
2001-02-20 21:00 ` Ingo Molnar
2001-02-21 0:36 Mikael Pettersson
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