From: Serge Belyshev <belyshev@depni.sinp.msu.ru>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@infradead.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Prevent users from disabling tickless
Date: Sun, 02 Jan 2011 10:59:38 +0000 [thread overview]
Message-ID: <87zkrj4llx.fsf@depni.sinp.msu.ru> (raw)
In-Reply-To: <20101221233942.GL1263@parisc-linux.org> (Matthew Wilcox's message of "Tue, 21 Dec 2010 16:39:43 -0700")
Matthew Wilcox <matthew@wil.cx> writes:
> Disabling NO_HZ has a serious negative effect on performance -- an extra
> 70us per I/O. Prevent users from deselecting it.
This is rather non-trivial change.
The common wisdom was that NO_HZ=y *adds* overhead, not removes it.
Thus, I propose:
(1) Retaining and elaborating the help text.
(2) Allow user to change the default.
next prev parent reply other threads:[~2011-01-02 10:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-21 23:39 Matthew Wilcox
2010-12-21 23:46 ` Rafael J. Wysocki
2010-12-22 0:24 ` Matthew Wilcox
2010-12-22 0:38 ` Rafael J. Wysocki
2010-12-22 21:00 ` Frank Rowand
2010-12-22 21:34 ` Matthew Wilcox
2010-12-22 22:32 ` Frank Rowand
2010-12-26 22:22 ` Len Brown
2010-12-26 23:20 ` Grant Coady
2010-12-26 23:23 ` Regarding kernel work queue issues Raj Kumar
2010-12-25 15:42 ` [PATCH] Prevent users from disabling tickless Stefan Richter
2011-01-02 8:57 ` Pavel Machek
2011-01-02 9:15 ` Eric Dumazet
2011-01-02 10:59 ` Serge Belyshev [this message]
2011-01-02 11:06 ` Remy Bohmer
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