From: Anton Blanchard <anton@samba.org>
To: Tejun Heo <htejun@gmail.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [QUESTION] The cost of local interrupt enable/disable
Date: Sun, 18 Sep 2005 00:32:05 +1000 [thread overview]
Message-ID: <20050917143204.GA17639@krispykreme> (raw)
In-Reply-To: <432C2169.2090300@gmail.com>
Hi,
> I'm curious about the cost of local_irq_enable/disable()'s on various
> architectures. I found a freebsd discussion thread by googling which
> says that each takes 3 cycles on i386 (very cheap), but for Pentium4,
> people are talking in the order of several hundreds cycles. Are these
> correct? How about other architectures?
It varies on ppc64, but its in the order of 10s of cycles. 40-50 cycles
is probably a decent estimation.
Anton
prev parent reply other threads:[~2005-09-17 14:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-17 14:00 [QUESTION] The cost of local interrupt enable/disable Tejun Heo
2005-09-17 14:32 ` Anton Blanchard [this message]
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