From: Paul Fulghum <paulkf@microgate.com>
To: Andrew Morton <akpm@digeo.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: 2.5.69 Interrupt Latency
Date: 08 May 2003 09:47:09 -0500 [thread overview]
Message-ID: <1052405227.1995.2.camel@diemos> (raw)
In-Reply-To: <20030507152856.2a71601d.akpm@digeo.com>
On Wed, 2003-05-07 at 17:28, Andrew Morton wrote:
> Paul Fulghum <paulkf@microgate.com> wrote:
> >
> > 2.5.69
> > Latency 100-110usec (5x increase)
> > Spikes from 5-10 milliseconds
> >
> Could be that some random piece of code forgot to reenable interrupts, and
> things stay that way until they get reenabled again by schedule() or
> syscall return.
>
> One way of finding the culprit would be:
>
> my_isr()
> {
> if (this interrupt is more than 5 milliseconds delayed)
> dump_stack();
> }
>
> the stack dump will point up at the place where interrupts finally got
> enabled.
Here is what I got (latency spike in milliseconds):
synclinkscc is a driver I maintain, and that is
where I placed the stack_dump()
Call Trace:
[<cc8bdf1a>] IsrStatusB+0x1fa/0x2c0 [synclinkscc]
[<cc8c5b29>] +0xf4/0x5ab [synclinkscc]
[<cc8c5fe0>] +0x0/0x14c8 [synclinkscc]
[<cc8be575>] mgscc_interrupt+0xa5/0x1b0 [synclinkscc]
[<cc8c5fe0>] +0x0/0x14c8 [synclinkscc]
[<c010d5eb>] handle_IRQ_event+0x4b/0x120
[<c010d89b>] do_IRQ+0x9b/0x110
[<c010bc00>] common_interrupt+0x18/0x20
[<c01255db>] do_softirq+0x6b/0xe0
[<c010d8fb>] do_IRQ+0xfb/0x110
[<c0108f90>] default_idle+0x0/0x40
[<c010bc00>] common_interrupt+0x18/0x20
[<c0108f90>] default_idle+0x0/0x40
[<c0108fc0>] default_idle+0x30/0x40
[<c010905a>] cpu_idle+0x4a/0x60
[<c0105000>] rest_init+0x0/0x60
[<c0456951>] start_kernel+0x181/0x1b0
[<c0456500>] unknown_bootoption+0x0/0x110
--
Paul Fulghum, paulkf@microgate.com
Microgate Corporation, http://www.microgate.com
next prev parent reply other threads:[~2003-05-08 14:34 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 16:12 2.5.69 Interrupt Latency Paul Fulghum
2003-05-07 19:41 ` 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 [this message]
[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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