Date: Thu, 1 Dec 2005 22:32:36 +0100 (CET) From: Wojciech Puchar <wojtek@tensor.3miasto.net> To: freebsd-questions@freebsd.org Subject: irq load when servicing ethernet Message-ID: <20051201222800.P65445@chylonia.3miasto.net>
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is it normal on AMD64 machine to have 10-15% CPU time spent in "interrupt" by sending file at 7MB/s by ftp to other machine? fxp0: <Intel 82551 Pro/100 Ethernet> port 0xec00-0xec3f mem 0xfbfff000-0xfbffffff,0xfbfc0000-0xfbfdfff f irq 17 at device 5.0 on pci2 nothing else uses irq 17 systat shows 3000 ints/s, with 1.8GHz CPU it's like 60000-90000 CPU clocks per single interrupt service. at least - TOO MUCH. with much higher traffic over hard drive interrupt percentage is below 1% if measurable at all.
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