On Wed, Oct 12, 2016 at 02:16:42AM +0000, Jonathan T. Looney wrote:

> Author: jtl
> Date: Wed Oct 12 02:16:42 2016
> New Revision: 307082
> URL: https://svnweb.freebsd.org/changeset/base/307082
> Log:
>   In the TCP stack, the hhook(9) framework provides hooks for kernel modules
>   to add actions that run when a TCP frame is sent or received on a TCP
>   session in the ESTABLISHED state. In the base tree, this functionality is
>   only used for the h_ertt module, which is used by the cc_cdg, cc_chd, cc_hd,
>   and cc_vegas congestion control modules.
>   Presently, we incur overhead to check for hooks each time a TCP frame is
>   sent or received on an ESTABLISHED TCP session.

Do you perform estimate of performane impact of this overhead?
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