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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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