linux-kernel - Re: [PATCH] x86: Reduce the default HZ value

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Message-ID: <20090508103125.00121311@lxorguk.ukuu.org.uk>
Date:	Fri, 8 May 2009 10:31:25 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	akataria@...are.com
Cc:	Chris Snook <chris.snook@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Reduce the default HZ value

> > As a side note Red Hat ships runtime configurable tick behaviour in RHEL
> > these days. HZ is fixed but the ticks can be bunched up. That was done as
> > a quick fix to keep stuff portable but its a lot more sensible than
> > randomly messing with the HZ value and its not much code either.
> > 
> Hi Alan, 
> 
> I guess you are talking about the tick_divider patch ? 
> And that's still same as reducing the HZ value only that it can be done
> dynamically (boot time), right ? 

Yes - which has the advantage that you can select different behaviours
rather than distributions having to build with HZ=1000 either for
compatibility or responsiveness can still allow users to drop to a lower
HZ value if doing stuff like HPC.

Basically it removes the need to argue about it at build time and lets
the user decide.
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