On Tue, Aug 08, 2000 at 01:15:06PM +0200, Tomasz Motylewski wrote:
> On Tue, 8 Aug 2000, Jacek M. Holeczek wrote:
>
> > I have some Linux machines (2*PIII/600 each) with Gigabit ethernet
> > connected via a Gigabit switch. The problem is that I get max. 35 MB/s
> > data transfer between two machines if I write to /dev/null. If I write
> > to ramdisk I get only max. 24 MB/s.
>
> There is undocumented option CONFIG_PACKET_MMAP in 2.4 kernel.
> Also Victor has mentioned some time ago a new mechanism for kernel/user
> space communication using shared memory (Victor, where to find some more info
> about it? Which programs are actually using it?)
Kiobuf.
>
> > and the kernel's space. The problem is - can I somehow convince the
> > Gigabit ethernet driver to write directly into this shared memory
> > (from kernel's space) ? So that any unnecessary moving of data is
>
> Allocate skb's from this memory pool ?
>
What it the gigabit ethernet card? This is easier with some cards
than others.
Also, if you are dedicating the ethernet card to a particular
use it is much easier to do this.
> > (Another problem is - can I use this shared memory module, by Tomasz
> > Motylewski, with a standard kernel 2.2.x, without any real time
> > extensions ?)
>
> Sure. It has no dependancy on RT at all.
>
> Serdecznie pozdrawiam,
> --
> Tomek
>
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---------------------------------------------------------
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