From: Paul Fulghum <paulkf@microgate.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: 2.5.69 Interrupt Latency
Date: 07 May 2003 11:12:20 -0500 [thread overview]
Message-ID: <1052323940.2360.7.camel@diemos> (raw)
Starting with kernel version 2.5.69, I am
encountering what appears to be increased
interrupt latency or spikes in interrupt latency.
I noticed this on two serial drivers that use programmed
I/O with FIFOs. On 2.5.68, no problems. On 2.5.69
plenty of underruns. Inspecting the driver tracing, it
does not look like lost interrupts.
I see this on 2 different machines
(one SMP server and one laptop).
There were changes involving the return type of
interrupt handlers (from void to irqreturn_t) in 2.5.69.
Could this be related?
Has anyone else seen similar results?
If I can get time, I'll try and hook up a scope
to measure the latencies precisely. I want to
check to see if this is a known problems before doing so.
--
Paul Fulghum, paulkf@microgate.com
Microgate Corporation, http://www.microgate.com
next reply other threads:[~2003-05-07 15:59 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 16:12 Paul Fulghum [this message]
2003-05-07 19:41 ` 2.5.69 Interrupt Latency Paul Fulghum
2003-05-07 22:28 ` Andrew Morton
2003-05-08 0:25 ` Paul Fulghum
2003-05-08 13:56 ` Paul Fulghum
2003-05-08 19:22 ` Andrew Morton
2003-05-08 19:35 ` Paul Fulghum
2003-05-08 23:20 ` Brian Gerst
2003-05-09 18:12 ` Paul Fulghum
2003-05-09 20:30 ` Paul Fulghum
2003-05-09 21:28 ` Andrew Morton
2003-05-12 13:57 ` Paul Fulghum
2003-05-12 14:06 ` Paul Fulghum
2003-05-12 16:24 ` Greg KH
2003-05-12 17:08 ` Paul Fulghum
2003-05-12 17:30 ` Greg KH
2003-05-12 17:49 ` Paul Fulghum
2003-05-12 18:01 ` Greg KH
2003-05-12 18:15 ` Paul Fulghum
2003-05-13 15:26 ` Alan Stern
2003-05-13 15:35 ` Paul Fulghum
2003-05-13 17:30 ` Greg KH
2003-05-13 13:01 ` Paul Fulghum
2003-05-13 18:09 ` Greg KH
2003-05-13 18:11 ` Greg KH
2003-05-13 21:35 ` Alan Stern
2003-05-13 21:48 ` Helge Hafting
2003-05-13 22:09 ` Alan Stern
2003-05-14 21:06 ` Paul Fulghum
2003-05-14 21:15 ` Johannes Erdfelt
2003-05-14 21:30 ` Greg KH
2003-05-14 21:45 ` Paul Fulghum
2003-05-13 20:17 ` Bill Davidsen
2003-05-13 22:39 ` Paul Fulghum
2003-05-14 20:52 ` Test Patch: " Alan Stern
2003-05-15 13:45 ` Paul Fulghum
2003-05-15 14:12 ` Paul Fulghum
2003-05-15 21:07 ` Alan Stern
2003-05-15 15:26 ` Paul Fulghum
2003-05-15 18:11 ` Alan Stern
2003-05-15 18:40 ` Paul Fulghum
2003-05-15 19:42 ` Paul Fulghum
2003-05-15 19:59 ` Paul Fulghum
2003-05-15 21:13 ` Alan Stern
2003-05-15 21:30 ` Paul Fulghum
2003-05-15 19:17 ` Paul Fulghum
2003-05-16 15:33 ` Alan Stern
2003-05-16 15:58 ` Paul Fulghum
2003-05-16 16:18 ` Paul Fulghum
2003-05-16 17:16 ` Alan Stern
2003-05-16 17:48 ` Paul Fulghum
2003-05-16 18:31 ` Paul Fulghum
2003-05-16 18:40 ` Alan Stern
2003-05-16 19:05 ` Paul Fulghum
2003-05-18 0:57 ` Andrew McGregor
2003-05-16 17:20 ` Alan Stern
2003-05-16 17:51 ` Paul Fulghum
2003-05-19 16:41 ` Alan Stern
2003-05-19 18:20 ` Paul Fulghum
2003-05-19 18:49 ` Alan Stern
2003-05-16 18:10 ` Paul Fulghum
2003-05-14 17:50 ` Paul Fulghum
2003-05-09 21:07 ` Andrew Morton
2003-05-09 21:28 ` Paul Fulghum
2003-05-08 14:47 ` Paul Fulghum
[not found] <20030507162013$0b67@gated-at.bofh.it>
[not found] ` <20030507195008$71e6@gated-at.bofh.it>
[not found] ` <20030507224009$4228@gated-at.bofh.it>
[not found] ` <20030508140022$2498@gated-at.bofh.it>
[not found] ` <20030508193016$1083@gated-at.bofh.it>
[not found] ` <20030509182012$49f0@gated-at.bofh.it>
[not found] ` <20030509204010$3c9b@gated-at.bofh.it>
2003-05-09 21:06 ` Arnd Bergmann
2003-05-09 21:25 ` Paul Fulghum
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