Re: tcp hostcache and ip fastforward for review

From: Andre Oppermann (oppermann_at_pipeline.ch)
Date: 11/11/03

  • Next message: Hajimu UMEMOTO: "Re: tcp hostcache and ip fastforward for review" 
    Date: Tue, 11 Nov 2003 10:37:44 +0100
To: popsong old <oldpopsong@yahoo.com>

    popsong old wrote:
    >
    > > ip_fastforward
    >
    > > - removes ip_flow forwarding code
    > > - adds full direct process-to-completion IPv4
    > forwarding code
    > > - handles ip fragmentation incl. hw support
    > (ip_flow did not)
    > > - supports ipfw and ipfilter (ip_flow did not)
    > > - supports divert and ipfw fwd (ip_flow did not)
    > > - drops anything it can't handle back to normal
    > ip_input
    >
    > Should we worry about the locking in IPFilter? It
    > seems that there are no locking at all in IPFilter for
    > FreeBSD.

    I haven't touched ipfilter, but yes, there is currently no
    locking in ipfilter. This ain't good I suppose. I guess it
    would be easy to slap a global ipfilter lock on there. We
    can't go directly into ipfilter to do locking because that
    would take ipfilter off the vendor branch and would make
    updating it impossible.

    > BTW, we'll get even better performance if we keep both
    > interfaces' MAC addresses in cache (and call
    > ifp->if_start directly). This requires to keep
    > ethernet header in mbuf untouched and is only relevant
    > in ethernet though. I implemented such layer 2 cache
    > in a local version of IPFilter and got some good
    > results.

    I don't understand why you want to do that unless you
    are doing bridging. We have to look up the mac address
    of the next hop anyway. If that is not already in the
    routing table it needs to do a arp lookup. 

    -- 
Andre
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