From owner-freebsd-performance@FreeBSD.ORG  Wed Oct 20 20:38:03 2004
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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Uwe Doering" <gemini@geminix.org>,
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Date: Wed, 20 Oct 2004 21:37:47 +0100
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Subject: Re: decreasing interrupt CPU load
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Actually it does work quite well on an SMP machine if you comment 
said lines out :)

    Steve
----- Original Message ----- 
From: "Uwe Doering" <gemini@geminix.org>
To: <freebsd-performance@freebsd.org>
Sent: Wednesday, October 20, 2004 9:16 PM
Subject: Re: decreasing interrupt CPU load


> Since you mentioned earlier that you run this on an SMP system, are you 
> aware that device polling is available only for single CPU kernels, that 
> is, not in SMP mode?  This is poorly documented, unfortunately.  You can 
> find out about it by looking at the first couple of lines of 
> 'sys/kern/kern_poll.c'.
> 
> Depending on what else you do on this server you might be better off 
> with running it in single CPU mode, with device polling enabled (kernel 
> compiled with DEVICE_POLLING and HZ=1000).  This could make a 
> considerable difference with the fxp driver already.  I suggest to try 
> it out before you start making changes to the hardware.


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