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Date:      Tue, 18 Jul 2006 14:13:48 +0100
From:      Alex Zbyslaw <xfb52@dial.pipex.com>
To:        John Baldwin <jhb@freebsd.org>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: [Fwd: Interrupts question]
Message-ID:  <44BCDE8C.9000003@dial.pipex.com>
In-Reply-To: <200607171326.17133.jhb@freebsd.org>
References:  <44BB9D21.3010400@dial.pipex.com> <200607171128.00303.jhb@freebsd.org> <44BBBDA6.4010209@dial.pipex.com> <200607171326.17133.jhb@freebsd.org>

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John Baldwin wrote:

>>>Interrupt storm detected on "irq18: uhci2"; throttling interrupt source
>>>      
>>>
>>which ties to the disk interrupt.  Will that be slowing things down?  
>>Would increasing the storm threshold help (especially disk 
>>performance)?  Guess I'm looking for any mitigation that might be possible.
>>
>>    
>>
>
>There's no easy answer on this.  You'll have to run your own benchmarks.  If 
>you don't need USB, then you may just want to leave it out of your kernel 
>which might help some.
>
>  
>
OK, thanks for the info and suggestions.  Regrettably, leaving out USB 
isn't an option for us.  I'll schedule some benchmarking for all that 
ample free time I have :-)

Best,

--Alex





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