lkml.org 
[lkml]   [2000]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.2.18Pre Lan Performance Rocks!


"Jeff V. Merkey" wrote:
>
> Pavel Machek wrote:
> >
> > Hi!
> >
> > > > > This is putrid. NetWare does 353,00,000/second on a Xenon, pumping out
> > > > > gobs of packets in between them. MANOS does 857,000,000/second. This
> > > > > is terrible. No wonder it's so f_cking slow!!!
> > >
> > > And please check your numbers, 857 million
> > > > context switches per second means that on a 1 GHZ CPU you do one context
> > > > switch per 1.16 clock cycles. Wow!
> > >
> > > Excuse me, 857,000,000 instructions executed and 460,000,000 context
> > > switches
> > > a second -- on a PII system at 350 Mhz. It's due to AGI
> > > optimization.
> >
> > That's more than one context switch per clock. I do not think
> > so. Really go and check those numbers.
>
> Pavel, The optimization exploits the multiple piplines in Intel's
> processors,
> and yes, it does execute more than one instruction per clock, it's
> optimized
> to execute in the processors parallel pipelines. The EMON numbers are
> accurate,
> and you can download the kernel and verify for yourself. These types of
> optimizations
> are possible when people have acccess to Intel Red Cover documents, then
> you
> get to know just how Intel's internal architectures are affected by
> different coding optimizations.
>
> Jeff

There's also another optimization in this kernel that allows it to
achieve greater than
100% scaling per processor by using a strong affinity algorithm (I hold
the patent
on this algorithimn, and by posting code based on it under the GPL, I
have released
it to the general public).

It relies on an anomoly in the design of Intel's cache controllers, and
with memory based
applications, I can get 120% scaling per procesoor by jugling the
working set of
executable code cached accros each processor. There's sample code with
this kernel
you can use to verify....
:-)

Jeff


> > Pavel
> > --
> > I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
> > Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [from the cache]
©2003-2011 Jasper Spaans