From: Jan Kiszka <jan.kiszka@domain.hid>
To: Steven Seeger <sseeger@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] overhead
Date: Mon, 11 Feb 2008 14:54:42 +0100 [thread overview]
Message-ID: <47B053A2.9010503@domain.hid> (raw)
In-Reply-To: <51CAD0CE1504444DBE77CBBE51A0135D376AD7@domain.hid>
Steven Seeger wrote:
> Is it normal for Xenomai to have significant overhead in userspace
> compared to older software running RTAI with all realtime threads in
> kernel modules? My application makes heavy use of inb/outb with iopl().
Significant overhead in user land can come from significant task
switches or a significant number of syscalls. But direct I/O should not
bite you. Any suspicious number of faults under /proc/xenomai/faults?
How did you measure the overhead in both systems?
Jan
--
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2008-02-11 13:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-11 6:04 [Xenomai-help] overhead Steven Seeger
2008-02-11 13:54 ` Jan Kiszka [this message]
2008-02-11 15:20 ` Steven Seeger
2008-02-11 16:10 ` Gilles Chanteperdrix
2008-02-11 17:43 ` Steven Seeger
2008-02-11 17:58 ` Jan Kiszka
2008-02-11 18:59 ` Philippe Gerum
2008-02-11 19:16 ` Steven Seeger
2008-02-11 20:11 ` Philippe Gerum
2008-02-11 20:18 ` Steven Seeger
2008-02-11 17:02 ` Jan Kiszka
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