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From: 914059751@qq.com (胡杨树)
To: linux-arm-kernel@lists.infradead.org
Subject: Query about loops_per_jiffy
Date: Tue, 19 Jan 2010 15:42:53 +0800	[thread overview]
Message-ID: <tencent_5CA6CD330328846756327199@qq.com> (raw)

Hi, oldhands:)
     
I have a question about how loops_per_jiffy converted to BogoMips, 

loops_per_jiffy * HZ  <-----------  that's number of instructions CPU executes in a second
BogoMips <-------------------------- Millions of instructions CPU executes in a second

so , do the math!
(loops_per_jiffy * HZ)/1000,000   will give a BogoMips value.

then why calibrate_delay do it like the following:
	printk(KERN_CONT "%lu.%02lu BogoMIPS (lpj=%lu)\n",
			loops_per_jiffy/(500000/HZ),
			(loops_per_jiffy/(5000/HZ)) % 100, loops_per_jiffy);


Am I missing something ?
Great thanks for any tips!

             reply	other threads:[~2010-01-19  7:42 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-19  7:42 胡杨树 [this message]
2010-01-19  8:21 ` Query about loops_per_jiffy Alessandro Rubini
2010-01-19  8:22 ` Russell King - ARM Linux
  -- strict thread matches above, loose matches on Subject: below --
2010-01-19 13:38 胡杨树

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