Comparison of FreeBSD/Linux TCP Throughput performance

Steve Dong sdong at
Fri Oct 16 01:01:05 UTC 2009

There are two gettimeofday calls, one at the beginning of the test and the
other at the end. netperf-2.4.4 is used. I believe gettimeofday is a
vsyscall in linux, but a real system call in freebsd.



-----Original Message-----
From: owner-freebsd-performance at
[mailto:owner-freebsd-performance at] On Behalf Of Adrian Chadd
Sent: Thursday, October 15, 2009 1:55 PM
To: Hongtao Yin
Cc: freebsd-performance at
Subject: Re: Comparison of FreeBSD/Linux TCP Throughput performance

2009/10/15 Hongtao Yin <htyin at>:
> Hi,
> I compared TCP performance between FreeBSD and Linux by running test 
> tools Netperf and Iperf with Intel NIC.

Did you compare syscalls made and time taken?

For example, do either/both of them do a lot of gettimeofday() calls?
FreeBSD and Linux have (had?) different behaviours and performance with

I'd suggest digging a bit deeper? :)

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