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Date:      Tue, 22 Apr 2008 15:13:30 -0400
From:      John Baldwin <jhb@freebsd.org>
To:        freebsd-smp@freebsd.org
Cc:        Rob <fbsdq@kuhl.co.uk>
Subject:   Re: SMP interrupt problem
Message-ID:  <200804221513.30270.jhb@freebsd.org>
In-Reply-To: <47EF6EC1.8040706@kuhl.co.uk>
References:  <47EF6EC1.8040706@kuhl.co.uk>

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On Sunday 30 March 2008 06:43:13 am Rob wrote:
> Hi, got a problem with high interrupt load on a couple of dual CPU servers. 
First 
> loaded 6.3 onto each of them and both displayed a constant load showing 
under 
> interrupt when looking at top. I then loaded 7.0 onto one of them and found 
> exactly the same problem. One of them has since had Fedora installed and 
works 
> fine with that. Below is the top -CS output and dmesg from the machine with 
7.0 
> installed, if anyone wishes to see the same info from the 6.3 install I have 
that 
> as well if needed.

Looks like IRQ 9 is firing a lot (vmstat -i output would be useful).  You 
might try disably certain parts of ACPI (such as thermal, etc.) to see if you 
can narrow down the source of the interrupts.

-- 
John Baldwin



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