From: Wolfgang Grandegger <wg@grandegger.com>
To: Mohamed HAMZAOUI <requinham@gmail.com>
Cc: Alexander Stein <alexander.stein@systec-electronic.com>,
Kurt Van Dijck <kurt.van.dijck@eia.be>,
Pavel Pisa <pisa@cmp.felk.cvut.cz>,
Linux-CAN <linux-can@vger.kernel.org>
Subject: Re: [SocketCan] Problem of accuracy
Date: Thu, 12 Jul 2012 00:19:40 +0200 [thread overview]
Message-ID: <4FFDFBFC.5030803@grandegger.com> (raw)
In-Reply-To: <CABMxt4iM=nKdZVwvq-13ByBYUyJv_s07fWBgYe3MdfTSRg-OaA@mail.gmail.com>
On 07/11/2012 12:11 AM, Mohamed HAMZAOUI wrote:
> Hi,
>
> i run cyclictest command like your description with system load at 90%
> (i use stress command stress -t 3600 -c 1 --io 2 --vm-bytes 256M) and
> i have :
> Min 0 Avg 158 Max 334
Please create almost 100% load on all CPUs and run the test for a while
(at least an hour).
> then i create a program with timer (set to zero for increasing to
> maximum CPU load) who call periodically an empty function. This
> program have a priority 99 set using sched_setscheduler(0, SCHED_RR,
> &p);
> when i call this program cyclictest freeze and display me after a
> moment a very bigger value in Max, then i concluded that the OS
> schedule correctly the process according to the priority order.
The programm does block cyclictest becase it does have a higher
priority. That's pretty normal.
Wolfgang
next prev parent reply other threads:[~2012-07-11 22:19 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CABMxt4ijuTMYFYXx0n4AYBO6-=SRD0U3F4BTA2=rWE80Z4-yOA@mail.gmail.com>
2012-07-05 8:38 ` Problem of accuracy Oliver Hartkopp
2012-07-07 10:02 ` [SocketCan] " Mohamed HAMZAOUI
2012-07-07 10:32 ` Wolfgang Grandegger
2012-07-08 19:43 ` Mohamed HAMZAOUI
2012-07-08 20:13 ` Wolfgang Grandegger
2012-07-08 20:30 ` Mohamed HAMZAOUI
2012-07-09 7:18 ` Wolfgang Grandegger
2012-07-09 8:14 ` Mohamed HAMZAOUI
2012-07-09 8:20 ` Wolfgang Grandegger
2012-07-09 9:19 ` Mohamed HAMZAOUI
2012-07-09 9:22 ` Wolfgang Grandegger
[not found] ` <CABMxt4jnztXqAmLFcBnqp3001QXds1nX3xA2y_ka=xCNr0cjjA@mail.gmail.com>
[not found] ` <4FFAB09F.6090800@grandegger.com>
[not found] ` <CABMxt4jLRKz8xKNbH3Qa=P0k1aEjMsqmo2vArGDo2O1Wf0=wGQ@mail.gmail.com>
2012-07-09 11:26 ` Fwd: " Mohamed HAMZAOUI
2012-07-09 11:40 ` Wolfgang Grandegger
2012-07-09 11:57 ` Mohamed HAMZAOUI
2012-07-09 12:15 ` Wolfgang Grandegger
2012-07-09 13:19 ` Pavel Pisa
2012-07-09 14:29 ` Mohamed HAMZAOUI
2012-07-09 14:35 ` Mohamed HAMZAOUI
2012-07-09 14:40 ` Kurt Van Dijck
2012-07-09 14:57 ` Alexander Stein
2012-07-09 15:39 ` Mohamed HAMZAOUI
2012-07-09 17:08 ` Oliver Hartkopp
2012-07-09 20:50 ` Wolfgang Grandegger
2012-07-10 22:11 ` Mohamed HAMZAOUI
2012-07-11 12:35 ` Mohamed HAMZAOUI
2012-07-11 22:22 ` Wolfgang Grandegger
2012-07-11 22:19 ` Wolfgang Grandegger [this message]
2012-07-09 6:55 ` Kurt Van Dijck
[not found] ` <1341488146.2416.9.camel@slaptop>
2012-07-05 13:57 ` [Socketcan-users] back to back can frames Kurt Van Dijck
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