From: Andreas Klauer <Andreas.Klauer@metamorpher.de>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] userlevel should not need to know about HZ?
Date: Thu, 23 Feb 2006 22:47:26 +0000 [thread overview]
Message-ID: <20060223224726.GB23114@EIS> (raw)
In-Reply-To: <20060223202145.GL3411@mandriva.com>
On Thu, Feb 23, 2006 at 05:21:46PM -0300, Andreas Hasenack wrote:
> Kernel people tell me users should never need to know the value of HZ
> used by the currently running kernel. One kernel hacker even told me
> that Linus once changed the value from 100 to 1000 just to see user
> space programs break.
Hmmm. Don't know the context of this statement, but from my (naive)
point of view, TBF is not a user space program. The user space program
is tc, and it just sets up structures in the kernel once. The shaping
itself is done in kernel space.
> So, how do we reliably calculate the minimum value for buffer/burst/maxburts?
Trial & Error, not that I ever had much luck with TBF though...
TBF doesn't really depend on the HZ value - you don't really need to know.
Still, TBF is affected by the HZ, like many other parts of the kernel too.
It can't be helped - dunno what else to say about it.
Regards
Andreas Klauer
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next prev parent reply other threads:[~2006-02-23 22:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-23 20:21 [LARTC] userlevel should not need to know about HZ? Andreas Hasenack
2006-02-23 22:47 ` Andreas Klauer [this message]
2006-02-23 23:45 ` Andreas Hasenack
2006-02-25 11:53 ` Andy Furniss
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