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From: rettw@rtwnetwork.com
To: "Andrew Morton" <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6 high CPU utilization with multimedia apps {Scanned}
Date: Sun, 23 May 2004 20:47:47 -0500 (CDT)	[thread overview]
Message-ID: <32786.192.168.0.243.1085363267.squirrel@webmail.rtwsecurenet.com> (raw)
In-Reply-To: <20040522172724.6c804068.akpm@osdl.org>

Hi Andrew,

> This could be an artifact from the instrumentation - if
> the application is
> doing short bursts of work the 1000Hz clock may be
> providing more accurate
> sampling.
>
> In 2.6, edit include/asm/param.h and set HZ to 100 and
> then redo the
> measurement.
>
That did it - the CPU utilization is back down to what I
am used to seeing on 2.4. - Now, the question is - what
was more accurate?  Was 2.4 producing abnormally low
numbers?  Or 2.6 abnormally high?  One interesting thing,
just below the define statements in the file mentioned
above is a conditional define that sets HZ to 100 anyway,
if not already defined - it almost seems that the 1000
value is bogus to begin with.

Thanks again for the help - this has been quite a mystery....

Thanks,

Rett Walters


  reply	other threads:[~2004-05-24  1:47 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-05-22 14:36 rettw
2004-05-23  0:27 ` Andrew Morton
2004-05-24  1:47   ` rettw [this message]
2004-05-24  2:13     ` Andrew Morton

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