From: "kus Kusche Klaus" <kus@keba.com>
To: "Evgeniy Polyakov" <johnpol@2ka.mipt.ru>
Cc: "John Ronciak" <john.ronciak@gmail.com>,
"Adrian Bunk" <bunk@stusta.de>,
"Lee Revell" <rlrevell@joe-job.com>,
<linux-kernel@vger.kernel.org>, <john.ronciak@intel.com>,
<ganesh.venkatesan@intel.com>, <jesse.brandeburg@intel.com>,
<netdev@vger.kernel.org>, "Steven Rostedt" <rostedt@goodmis.org>
Subject: RE: My vote against eepro* removal
Date: Fri, 20 Jan 2006 11:51:23 +0100 [thread overview]
Message-ID: <AAD6DA242BC63C488511C611BD51F367323326@MAILIT.keba.co.at> (raw)
From: Evgeniy Polyakov [mailto:johnpol@2ka.mipt.ru]
> Each MDIO read can take upto 2 msecs (!) and at least 20
> usecs in e100,
> and this runs in timer handler.
> Concider attaching (only compile tested) patch which moves
> e100 watchdog
> into workqueue.
Tested the patch. Works and has the expected effects:
Fully preemptible kernel:
No change: 500 us delay at rtprio 1, no delay at higher rtprio.
(you just moved the 500 us piece of code from one rtprio 1 kernel
thread to another rtprio 1 kernel thread).
Kernel with desktop preemption:
Originally: Threads at any rtprio suffered from 500 us delay.
With your patch: Only rtprio 1 threads suffer from 500 us delay,
no delay at higher rtprio.
--
Klaus Kusche (Software Development - Control Systems)
KEBA AG Gewerbepark Urfahr, A-4041 Linz, Austria (Europe)
Tel: +43 / 732 / 7090-3120 Fax: +43 / 732 / 7090-6301
E-Mail: kus@keba.com WWW: www.keba.com
next reply other threads:[~2006-01-20 10:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-20 10:51 kus Kusche Klaus [this message]
2006-01-20 11:05 ` My vote against eepro* removal Evgeniy Polyakov
-- strict thread matches above, loose matches on Subject: below --
2006-01-24 7:38 kus Kusche Klaus
2006-01-23 11:01 kus Kusche Klaus
2006-01-23 20:23 ` Jesse Brandeburg
2006-01-20 11:27 kus Kusche Klaus
2006-01-20 10:19 kus Kusche Klaus
2006-01-20 11:02 ` Evgeniy Polyakov
2006-01-21 0:45 ` Lee Revell
2006-01-20 9:37 kus Kusche Klaus
2006-01-20 9:55 ` Evgeniy Polyakov
2006-01-21 0:40 ` Lee Revell
2006-01-21 1:19 ` John Ronciak
2006-01-21 1:30 ` Lee Revell
2006-01-21 2:01 ` John Ronciak
2006-01-21 3:56 ` Lee Revell
2006-01-19 10:26 kus Kusche Klaus
2006-01-19 16:20 ` Adrian Bunk
2006-01-19 17:16 ` John Ronciak
2006-01-19 19:09 ` Steven Rostedt
2006-01-19 22:57 ` Steven Rostedt
2006-01-19 10:08 kus Kusche Klaus
2006-01-19 7:19 kus Kusche Klaus
2006-01-19 7:24 ` Lee Revell
2006-01-19 7:42 ` Arjan van de Ven
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