Subject: Re: netperf vs 'real world' disk-net-disk throughput, BSD vs Linux
To: George Michaelson <>
From: Bill Studenmund <>
List: current-users
Date: 09/10/2004 16:50:38
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On Fri, Sep 10, 2004 at 01:03:16PM +1000, George Michaelson wrote:
> FYAmusement, I've been testing a NetBSD, FreeBSD 5.3, debian/redhat combo
> with the same hardware with some people here, and while we can reliably
> get 400-600mbit/sec on back-to-back gig-e copper from netperf, when we do
> scp <bigfile> even to /dev/null, we're getting much much lower total
> throughput, around 100mbit max.

One thing scp will do is it will encrypt the transmitted data. If you want=
raw throughput, you don't want to do that.

I think you can get scp and ssh to do a null cipher, which would be closer=
to what you want.

> Its reasonably new SATA disks on RAID, we suspect that its a combination
> of application overhead, disk I/O, PCI, phase-of-the-moon.

Take care,


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