7.1-PRERELEASE : bad network performance (nfe0)

Kevin Oberman oberman at es.net
Mon Sep 29 21:41:47 UTC 2008

> Date: Mon, 29 Sep 2008 11:03:10 +0200
> From: Holger Kipp <hk at alogis.com>
> Sender: owner-freebsd-stable at freebsd.org
> On Sun, Sep 28, 2008 at 06:30:03PM -0400, firmdog at gmail.com wrote:
> No....you misunderstood.  The 7.1 box was connected to a 5.4 box
> doing a 50GB > data transfer over rsync.  Both nics were 1000 full
> duplex with a crossover cable.  > The speed performance was terrible
> and I could only get up to 10 Mb/s and there > was NO switch involved.
> I believe there is a problem or bug involved with the > driver.  Have
> the drivers or stack been updated in 7.1?  What else can I provide?
> Hi, I only flipped through the messages in this thread, faintly
> remembering someone writing something about ssh. Anyway, if you're
> copying using ssh (scp, sftp), then the transfer rate is much less
> than what you'd expect - due to the encryption/decryption overhead
> (unless you have hardware acceleration on both sideds).
> Just my two cents (Euro) on general reasons for slow data transfers.

ssh(1) and it's kin, scp(1) and sftp(1), are not at all well designed
for performance. There are several issues and if you want details, read

If you want to use ssh(1) for high-bandwidth TCP streams, especially
scp/sftp, install openssh-portable from ports after selecting the
"enable HPN-SSH patch" option. You may want to over-write the base
install, but be sure to edit make.conf/src.conf so that a system upgrade
won't re-overwrite it.
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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