Date: Fri, 22 Oct 2004 17:04:15 +0300 From: "Oleg Gawriloff" <barzog@telecom.by> To: "Steven Hartland" <killing@multiplay.co.uk> Cc: freebsd-performance@freebsd.org Subject: Re: decreasing interrupt CPU load Message-ID: <005301c4b840$0444ec20$0c0210ac@ADMIN1> References: <004e01c4b831$c317c640$0c0210ac@ADMIN1> <028b01c4b837$b7532c90$7f06000a@int.mediasurface.com>
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Hello, Steven! You wrote to "Oleg Gawriloff" <barzog@telecom.by>; <freebsd-performance@freebsd.org> on Fri, 22 Oct 2004 14:04:46 +0100: >When you say not working are you seeing no more that >HZ interrupts per second? After compiling in you did >enable it with the sysctl? After recompiling kernel with options HZ=1000 options DEVICE_POLLING and kern.polling.enable=1 number of interrupts shown in systat -v 1 does not change (about 5k). CPU interrupt load does not changes as well. Also RTT in ping increases from 2ms to 20ms. After disabling polling RTT goes back to 2ms. So we decided that polling does not work on i82550 in SMP. With best regards, Oleg Gawriloff.
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