Date: Fri, 26 Mar 2004 09:35:48 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Kenneth Culver <culverk@sweetdreamsracing.biz> Cc: freebsd-current@freebsd.org Subject: Re: poor gigabit ethernet performance with amd64 + sk0 Message-ID: <20040326153548.GD3446@dan.emsphone.com> In-Reply-To: <20040325220939.2ogcsoogkoookwwc@www.sweetdreamsracing.biz> References: <20040325220939.2ogcsoogkoookwwc@www.sweetdreamsracing.biz>
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In the last episode (Mar 25), Kenneth Culver said: > I recently did a short file transfer over gigabit ethernet in both > x86 and amd64. On x86 it appears the limiting factor is the laptop > I'm transferring to. I get about 20MB/sec to the laptop in x86. But > on amd64, I'm not sure what the limiting factor is, because I max out > at about 2.8MB/sec with the EXACT same hardware. Here are the dmesg > lines for that ethernet card: Make sure you're testing ethernet speeds and not disk speeds; try something like ttcp or tcpblast. Even a pII/600mhz can do 50MB/sec; any modern CPU should be able to do 90. You might also want to do a long test, then run systat -v to see if the CPU load or interrupts/sec is different between x86 and amd64 modes. -- Dan Nelson dnelson@allantgroup.com
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