10 gigabit Ethernet - Add on question

[Robert Goley]

I would like to see that program if the offer is still open.

Robert

On Tuesday 08 January 2008 08:56, Kuba Ober wrote:
> On Tuesday 08 January 2008, Matthias Saou wrote:
> > Kuba Ober wrote :
> > > On Monday 31 December 2007, Robert D. Holtz - Lists wrote:
> > > > How do you topple the memory bus/cup/peripheral bus restraints to
> > > > even push past ~2gbps per host, in a practical host environment?
> > >
> > > 1gbps is AFAIK less than 100 megabytes/s if you factor in overheads.
> > >
> > > So 10 gbps is say 800 megabytes/s, practically, at a high link
> > > utilization. It should be relatively easy to achieve that on modern
> > > hardware. The memory bandwidths are a few times beyond that, same goes
> > > for DMA bandwidths. With current PCI Express-supporting chipsets, if
> > > you do memory-to-network transfers (just for benchmarking), the other
> > > bus devices won't even notice, and all the CPU will see is less
> > > leftover memory bandwidth.
> > >
> > > One DDR2 PC-3200 memory stick will happily transfer way more than 1GB/s
> > > to 4 PCIe lanes, on relatively standard hardware. I tried.
> >
> > This is true for "raw" network traffic, because limits quickly depend
> > on what and how you transfer. My testings on some brand new dual quad
> > core PE1950 III servers (E5410 @ 2.33GHz w/ 6MB cache) show for
> > instance that an rsync/ssh transfer from one to the other maxes out at
> > 50MB/s because that corresponds to one ssh process taking 100% of one
> > of the 8 cores. This is one of those cases where pure MHz power
> > would be more useful than having so many cores :-)
>
> That's obvious enough. You can parallelize ssh connections, all it takes is
> a short program to split the data onto 2 or more connections. If you want
> it, I can post one.
>
> Cheers, Kuba
>
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