FreeBSD 7.1 taskq em performance

Ivan Voras ivoras at
Tue Apr 28 10:53:39 UTC 2009

Joseph Kuan wrote:
> Hi all,
>   I have been hitting some barrier with FreeBSD 7.1 network performance. I
> have written an application which contains two kernel threads that takes
> mbufs directly from a network interface and forwards to another network
> interface. This idea is to simulate different network environment.
>   I have been using FreeBSD 6.4 amd64 and tested with an Ixia box
> (specialised hardware firing very high packet rate). The PC was a Core2 2.6
> GHz with dual ports Intel PCIE Gigabit network card. It can manage up to 1.2
> million pps.
>   I have a higher spec PC with FreeBSD 7.1 amd64 and Quadcore 2.3 GHz and
> PCIE Gigabit network card. The performance can only achieve up to 600k pps.
> I notice the 'taskq em0' and 'taskq em1' is solid 100% CPU but it is not in
> FreeBSD 6.4.

Maybe this could help you:

It's a SMP patch to the em driver.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 260 bytes
Desc: OpenPGP digital signature
Url :

More information about the freebsd-threads mailing list