From: Ingo Molnar <mingo@elte.hu>
To: Elladan <elladan@eskimo.com>
Cc: Peter Williams <pwil3058@bigpond.net.au>,
Con Kolivas <kernel@kolivas.org>, Andrew Morton <akpm@osdl.org>,
Nick Piggin <piggin@cyberone.com.au>,
linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Likelihood of rt_tasks
Date: Sat, 10 Jul 2004 13:19:18 +0200 [thread overview]
Message-ID: <20040710111918.GB22265@elte.hu> (raw)
In-Reply-To: <20040710035737.GA7552@eskimo.com>
* Elladan <elladan@eskimo.com> wrote:
> Average wall speed of RT task wakeup isn't really an issue - the issue
> is deterministic worst-case latency. Adding a hundred cycles every time
> won't cause someone to miss a deadline. [...]
we are dealing here with about half a cycle or so overhead. (an extra
jump back to the 'likely' section) Often the BTB can even totally
eliminate the overhead. Worst-case we've got a slightly larger icache
footprint. But all in one it's not really an issue, and if you compile
for embedded it wont be done by the compiler anyway.
Ingo
prev parent reply other threads:[~2004-07-10 11:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-09 10:00 Likelihood of rt_tasks Con Kolivas
2004-07-09 10:17 ` Ingo Molnar
2004-07-09 23:53 ` Peter Williams
2004-07-10 0:16 ` Con Kolivas
2004-07-10 0:41 ` Peter Williams
2004-07-10 0:45 ` Con Kolivas
2004-07-10 11:15 ` Ingo Molnar
2004-07-10 12:05 ` Nick Piggin
2004-07-10 3:57 ` Elladan
2004-07-10 11:19 ` Ingo Molnar [this message]
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