From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: "Karch, Joshua" <jkarch@domain.hid>
Cc: xenomai@xenomai.org, Jan Kiszka <jan.kiszka@domain.hid>
Subject: Re: [Xenomai-help] serial port overrun problem RT TASK geode latencies too high
Date: Fri, 25 Apr 2008 00:59:05 +0200 [thread overview]
Message-ID: <18449.4281.679002.804576@domain.hid> (raw)
In-Reply-To: <51B669A8A7D2914E9AB2B3F40AC6553E646F2F@afsexc01.aurora.aero>
Karch, Joshua wrote:
> Gilles,
>
> The framebuffer support was added to the kernel, and magically the latency is now down to the 1300 range. I modprobed the timerbench module and so the number 1340 is the worst I've seen. The next thing to do is to play around with the outb and SMI. I got to the point where I haven't found any errors in a two minute test.
1300 is still way too high. A normal latency is something less than
100us, probably even less than 50us.
--
Gilles.
next prev parent reply other threads:[~2008-04-24 22:59 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-22 22:46 [Xenomai-help] Xenomai serial port c++ code and / or xeno-- (xenomm-0.0.1) install problem Karch, Joshua
2008-04-23 0:12 ` Gilles Chanteperdrix
[not found] ` <51B669A8A7D2914E9AB2B3F40AC6553E646F15@domain.hid>
2008-04-23 13:58 ` [Xenomai-help] Xenomai serial port c++ code and / or xeno--(xenomm-0.0.1) " Gilles Chanteperdrix
2008-04-23 14:25 ` Karch, Joshua
2008-04-23 14:30 ` Gilles Chanteperdrix
2008-04-23 15:43 ` Karch, Joshua
2008-04-23 18:10 ` Gilles Chanteperdrix
[not found] ` <51B669A8A7D2914E9AB2B3F40AC6553E646F1D@afsexc01.aurora.aero>
2008-04-23 21:20 ` [Xenomai-help] FW: " Karch, Joshua
2008-04-23 21:28 ` [Xenomai-help] " Gilles Chanteperdrix
2008-04-23 21:36 ` Karch, Joshua
2008-04-23 22:14 ` [Xenomai-help] serial port overrun problem RT TASK Karch, Joshua
2008-04-24 6:43 ` Gilles Chanteperdrix
2008-04-24 7:04 ` Jan Kiszka
2008-04-24 14:16 ` Karch, Joshua
2008-04-24 14:30 ` Gilles Chanteperdrix
2008-04-24 16:58 ` Karch, Joshua
2008-04-24 17:16 ` Gilles Chanteperdrix
2008-04-24 22:37 ` [Xenomai-help] serial port overrun problem RT TASK geode latencies too high Karch, Joshua
2008-04-24 22:59 ` Gilles Chanteperdrix [this message]
2008-04-25 16:04 ` [Xenomai-help] Geode Latency Problem (Was: serial port overrun problem) Karch, Joshua
2008-04-25 16:12 ` Gilles Chanteperdrix
2008-04-24 13:59 ` [Xenomai-help] serial port overrun problem RT TASK Karch, Joshua
2008-04-24 14:01 ` Gilles Chanteperdrix
[not found] ` <51B669A8A7D2914E9AB2B3F40AC6553E646F52@domain.hid>
[not found] ` <18454.9396.476627.446653@domain.hid>
[not found] ` <51B669A8A7D2914E9AB2B3F40AC6553E646F54@domain.hid>
[not found] ` <48162C69.6040101@domain.hid>
[not found] ` <18454.12323.344999.258031@domain.hid>
[not found] ` <51B669A8A7D2914E9AB2B3F40AC6553E646F55@domain.hid>
[not found] ` <48163EE7.5000604@domain.hid>
[not found] ` <18454.17297.451664.334250@domain.hid>
[not found] ` <48164652.5090102@domain.hid>
[not found] ` <2ff1a98a0804290252j1c9dc444kffb345ebaeb123d@domain.hid>
[not found] ` <48187366.2060006@domain.hid>
2008-04-30 18:13 ` [Xenomai-help] Segfault Problems with Message Queues Karch, Joshua
2008-04-30 18:31 ` Philippe Gerum
2008-04-30 18:41 ` Karch, Joshua
2008-04-30 18:48 ` Philippe Gerum
2008-04-30 19:22 ` Karch, Joshua
2008-04-30 18:36 ` Philippe Gerum
2008-04-30 19:19 ` Gilles Chanteperdrix
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