Mailing List Archive

On Tue, Dec 26, 2000 at 10:58:34AM -0800, Florin Andrei wrote:
> Is there any advantage in using a dual-CPU balancer
> over a single-CPU?
>
> (...and i guess this question too is a nice FAQ entry
> ;-) )

The _theory_ is that under 2.2.x no and uder 2.4.x yes.


--
Horms

On Tue, 26 Dec 2000, Horms wrote:

> On Tue, Dec 26, 2000 at 10:58:34AM -0800, Florin Andrei wrote:
> > Is there any advantage in using a dual-CPU balancer
> > over a single-CPU?
> >
> > (...and i guess this question too is a nice FAQ entry
> > ;-) )
>
> The _theory_ is that under 2.2.x no and uder 2.4.x yes.
>

Make that _reality_. In some tests I've done with FTP, I have seen
*significant* improvements using dual and quad processors using 2.4. Under
2.2, there are improvements, but not astonishing ones.

Things like 90% saturation of a Gig link using quad processors, 70% using
dual processors and 55% using a single processor under 2.4.0test. Really
amazing improvements.
--
Michael Brown

On Tue, 26 Dec 2000, Michael E Brown wrote:

> On Tue, 26 Dec 2000, Horms wrote:
>
> > On Tue, Dec 26, 2000 at 10:58:34AM -0800, Florin Andrei wrote:
> > > Is there any advantage in using a dual-CPU balancer
> > > over a single-CPU?
> > >
> > > (...and i guess this question too is a nice FAQ entry
> > > ;-) )
> >
> > The _theory_ is that under 2.2.x no and uder 2.4.x yes.
> >
>
> Make that _reality_. In some tests I've done with FTP, I have seen
> *significant* improvements using dual and quad processors using 2.4. Under
> 2.2, there are improvements, but not astonishing ones.
>
> Things like 90% saturation of a Gig link using quad processors, 70% using
> dual processors and 55% using a single processor under 2.4.0test. Really
> amazing improvements.

What are the percentage differences on each processor configuration
between 2.2 and 2.4? How does a 2.2 system compare to a 2.4 system on the
same hardware?

--
Michael D. Jurney
mike@jurney.org

On Tue, 26 Dec 2000 mike@jurney.org wrote:

>
> On Tue, 26 Dec 2000, Michael E Brown wrote:
>
> > On Tue, 26 Dec 2000, Horms wrote:
> >
> > > On Tue, Dec 26, 2000 at 10:58:34AM -0800, Florin Andrei wrote:
> > > > Is there any advantage in using a dual-CPU balancer
> > > > over a single-CPU?
> > > >
> > > > (...and i guess this question too is a nice FAQ entry
> > > > ;-) )
> > >
> > > The _theory_ is that under 2.2.x no and uder 2.4.x yes.
> > >
> >
> > Make that _reality_. In some tests I've done with FTP, I have seen
> > *significant* improvements using dual and quad processors using 2.4. Under
> > 2.2, there are improvements, but not astonishing ones.
> >
> > Things like 90% saturation of a Gig link using quad processors, 70% using
> > dual processors and 55% using a single processor under 2.4.0test. Really
> > amazing improvements.
>
> What are the percentage differences on each processor configuration
> between 2.2 and 2.4? How does a 2.2 system compare to a 2.4 system on the
> same hardware?

I haven't had much of a chance to do a full comparison of 2.2 vs 2.4, but
most of the evidence on tests that I have run points to a > 100%
improvement for *network intensive* tasks.

--
Michael Brown