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Date:      Wed, 29 Aug 2012 12:36:53 +0200
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-stable@freebsd.org
Subject:   Re: IPv4 vs. IPv6 Ethernet Performance
Message-ID:  <k1krch$590$1@ger.gmane.org>
In-Reply-To: <503CE60F.8040007@yahoo.de>
References:  <503CE60F.8040007@yahoo.de>

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On 28/08/2012 17:38, Norbert Aschendorff wrote:

> Configuration		v6	v4
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Linux -> Linux		925	935  # <=3D This could be v6's 40B header
> 				     # vs. v4's 20B
> Linux -> FreeBSD	450	700
> FreeBSD -> Linux	455	920
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> The FreeBSD->Linux value shows that the ethernet chip on the FreeBSD
> machine (it's Intel stuff on both sides, using the em(4) driver on
> FreeBSD) is able to send at full 1G speed. But why is IPv6 so slow?

There are some more numbers, FreeBSD-FreeBSD here:
http://people.freebsd.org/~bz/bench/

Apparently, the software stack is capable enough so it may be a driver
problem in your case.



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