Linux-kernel mailing list archive 2000-04,: Re: Interesting analysis of linux kernel threading by IBM

# Re: Interesting analysis of linux kernel threading by IBM

David Lang (dlang@diginsite.com)
Mon, 24 Jan 2000 08:46:57 -0800 (PST)

- Messages sorted by: [ date ][ thread ][ subject ][ author ]
- Next message: Tim Waugh: "[patch] 2.3.41pre2: avoid bounce buffers (again!)"
- Previous message: David Woodhouse: "Re: IRQ clash problems with 2.2.14 and 2.3.33?"

On Sun, 23 Jan 2000, Sean Hunter wrote:

> On Sun, Jan 23, 2000 at 03:50:32PM +0100, Davide Libenzi wrote:
> > We can write this :
> >
> > TS_old = Ko + O( N )
> > TS_new = Kn + O( log( N ) )
> >
> > Where N is the RQ size.
> >
> > Now the curve of TS_new( N ) goes down ( intersect ) the curve TS_old( N ) in a
> > point that in the worse case I've measured is N = 8 ( I prefer always to report
> > worse cases to avoid to be shooted ), but I've measured even 4 with a medium
> > that I can think to be near to six.
>
> In other words, almost all real-world cases lose. Nice...
>
> Sean

If you are on a 8 way SMP box a load of 4 is very reasonable. on anything
less then a 4-way SMP box it is almost certinly a loss.

David Lang

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

- Next message: Tim Waugh: "[patch] 2.3.41pre2: avoid bounce buffers (again!)"
- Previous message: David Woodhouse: "Re: IRQ clash problems with 2.2.14 and 2.3.33?"