Date: Tue, 06 Feb 2007 09:08:45 -0500 From: Mike Tancsa <mike@sentex.net> To: Chris <chrcoluk@gmail.com>, "Justin Robertson" <justin@sk1llz.net> Cc: freebsd-questions@freebsd.org Subject: Re: 6.x, 4.x ipfw/dummynet pf/altq - network performance issues Message-ID: <200702061408.l16E8cU1042825@lava.sentex.ca> In-Reply-To: <3aaaa3a0702060503j12304748y89ef16cd41ddcbc8@mail.gmail.com > References: <45C7A9BD.30403@sk1llz.net> <5pkfs2pfv5sjhiiaegg3bae6casglevhpt@4ax.com> <45C7ED9E.1080109@sk1llz.net> <3aaaa3a0702060503j12304748y89ef16cd41ddcbc8@mail.gmail.com>
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At 08:03 AM 2/6/2007, Chris wrote:
>On 06/02/07, Justin Robertson <justin@sk1llz.net> wrote:
>>
>>I've actually already done everything you've suggested with little or no
>>impact at all. One point where we have different results is with
>>ADAPTIVE_GIANT, I actually noticed a drop of about 50kpps thruput when
>>disabling it.
>>
>Hmm I am surprised not more attention has been brought by your
>observations, I have noticed myself freebsd 4.x holds up much better
>during ddos then 5.x and 6.x probably due its better robustness and
>lighter code.
When I ran through the tests with pmc compiled in there wasnt any
obvious areas where it was spending a lot of time. What I was told
was that the locking overhead was a big penalty and more emphasis was
put on correctness than speed going from RELENG_4 to RELENG_5 and
above. Supposedly the payoff will come as more CPU cores get added
as there is better potential to scale with this design. While I did
see some improvement in the box with SMP compiled in, it still has a
ways to go for this application
>I do hope but will probably be dissapointed stability and robustness
>is on the todo list for the devs in aiming to get 6.x to where 4.x
>was.
I have found stability to be quite good. But certainly as a firewall
or router, the speed is not there yet.
---Mike
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