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Date:	Wed, 3 Oct 2007 16:31:15 +0800
From:	Sonny <smaniaol@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: kernel 2.4 vs 2.6 Traffic Controller performance

On 10/3/07, Eric Dumazet <dada1@...mosbay.com> wrote:
> Sonny a écrit :
> > Hello
> > This is a repost, there seems to have a misunderstanding before.
> >
> > I hope this is the right place to ask this. Does any know if there is a
> > substantial difference in the performance of the traffic controller
> > between kernel 2.4 and 2.6. We tested it using 1 iperf server and use
> > 250 and 500 clients, altering the burst.
> >
> > This is the set-up:
> > iperf client -  router (w/ traffic controller) - iperf server
> >
> > We use the top command inside the router to check the idle time of our
> > router to see this. The results we got from the 2.4 kernel shows
> > around 65-70% idle time while the 2.6 shows
> > 60-65% idle time. We tried to use MRTG and we're not getting any
> > results either. We want to know if we could improve the bandwidth by
> > upgrading the kernel, else we would have to get a new bandwidth
> > manager.  Have anyone performed a similar test or can suggest a better
> > way to do this. Thanks in advance.
> > -
> Hi Sonny
>
> I am not sure what you are asking here. 65-70% idle time (or 60-65%) is fine.
>
> 2.6 is also not very meaningfull, there are a lot of changes between 2.6.0 and
> 2.6.23 :)
>
we're using 2.6.22

> Why should you upgrade kernel ?
we would like to test the difference bet 2 kernels performance

> What bandwidth do you handle ?
10 mbps

> What kind of platform is it ? (a new kernel wont help much if its a real old
> machine, or old NICs)
it's a P IV 2.8 GHz HT with 512 MB
>
> You seem to have some bandwidth problem but focus on cpu affairs...
Bandwidth is not a problem, we can get 10mbps without a hitch. But we
would like to know the scalability on the CPU vs the number of
clients. So far, for both kernels, we're getting 50% CPU utilization
using 500 clients and 384 burst kbps each.
-
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