Netgraph performance question

[Ruslan Ermilov]

On Fri, Feb 04, 2005 at 03:43:35PM -0600, Guy Helmer wrote:
> 
>    I'm sorry, I mis-wrote.  My ng_tee is actually modified to only passes
>    packets to the r2l/l2r hooks if they are connected, otherwise packets are
>    passed directly to the left/right hooks (so it's an optional divert),  so
>    there is no m_dup anymore in my modified ng_tee.
> 
>    I assumed that the bridging and trip through userland would only add
>    latency to the connection, but the result of the performance test seemed
>    to indicate that there is either a bottleneck I need to solve or my
>    testing methodology was flawed.
> 
If you pass packets through userland, then it is even more performance
penalty, as it involves userspace<->kernel copying, twice for each
packet.


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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