>
> On Fri, Mar 24, 2000 at 03:27:57PM -0800, Scott Lurndal wrote:
> >
> > On a single bus? Ah, alpha - 64 bit PCI bus, right? Is it 33mhz or
> > 66 mhz?
>
> Yup, single bus. We are seeing this throughput on a Quadrics Elan
> interconnect. What I am hoping to do is have my file system on one
> bus and the Elan on the other bus and hopefully saturate the link on
> the Elan with file I/O. I'm pretty sure these PCI busses are 33MHz.
> The Elan supports 400MB/s on the wire and is capable of 66MHz so I
> would think we would be seeing better performance out of it if it were
> 66MHz. I also think I read it was 33MHz in the owner's manual. :)
Ok. 33mhz makes sense. That should peak at ~264 megabytes/second
and with arbitration delays and bus turnaround delays accounted
for, about 220 MB/sec is optimal.
> >
> > Insofar as acceptance goes, I'm trying to craft the patch in
> > such a way that it won't be objectionable to the community -
> > but no guarantees. We are willing to work with the community
> > to ensure acceptance eventually. It is likely that the XFS
> > work will make use of the scsi raw stuff for performance reasons,
> > so we may push it through that vehicle - xfs should be released
> > shortly (perhaps next month).
> >
>
> Haha! Yeah, we are trying to do the same sort of thing with some of our
> changes. Make the one that most people want to depend on something
> that isn't in the kernel already. At least this way people will see
> how these changes are used. If someone has a work around for us that
> is already in the kernel, it is fine since I would like to avoid
> bloat, but I seriously think that the Linux kernel is still in its
> infancy and has a ways to go for scaling up to ASCI level HPC.
Agreed.
Have a good weekend,
scott
>
>
> BAPper
>
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