From: Andrew Morton <akpm@osdl.org>
To: corbet@lwn.net (Jonathan Corbet)
Cc: ak@muc.de, linux-kernel@vger.kernel.org
Subject: Re: [MICROPATCH] Make x86_64 build work without GART_IOMMU
Date: Fri, 30 Apr 2004 15:08:28 -0700 [thread overview]
Message-ID: <20040430150828.1594ad6a.akpm@osdl.org> (raw)
In-Reply-To: <20040430214040.25268.qmail@lwn.net>
corbet@lwn.net (Jonathan Corbet) wrote:
>
> > > My Radeon 9200SE goes nuts if I build a GART-enabled
> > > kernel. Haven't figured out why...
> >
> > Define 'nuts' and supply full boot log (with GART enabled)
>
> Oops, sorry for the technical term...:)
"No User Time Scheduled". Silly Andi.
> Andrew asked for a profile to help track down where the kernel loop is. I
> just did one, but the results are less than illuminating:
>
> 105219 total 0.0448
> 85232 __delay 2663.5000
> 14076 default_idle 293.2500
> 4679 __do_softirq 26.5852
> 474 check_poison_obj 1.0216
> 197 handle_IRQ_event 2.0521
> 91 kmem_cache_free 0.1034
Yup, that's the one. There are various loops where the driver spins on a
hardware register, with an mdelay() in the loop.
Can you get a sysrq-p trace?
next prev parent reply other threads:[~2004-04-30 22:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1QMlc-5kS-39@gated-at.bofh.it>
2004-04-30 21:00 ` Andi Kleen
2004-04-30 21:40 ` Jonathan Corbet
2004-04-30 22:07 ` Andi Kleen
2004-05-03 15:09 ` Jonathan Corbet
2004-05-03 16:23 ` Roland Dreier
2004-05-03 16:33 ` Andi Kleen
2004-04-30 22:08 ` Andrew Morton [this message]
2004-04-30 19:57 Jonathan Corbet
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