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* Re: Xen & I/O in clusters - problems!
@ 2004-10-15 10:48 Håvard Bjerke
  2004-10-15 14:02 ` Mark A. Williamson
  0 siblings, 1 reply; 8+ messages in thread
From: Håvard Bjerke @ 2004-10-15 10:48 UTC (permalink / raw)
  To: xen-devel; +Cc: mark.williamson, Rune.Johan.Andresen

Here are some details on our horrible benchmark results:


System setup:

Ethernet controller: 
	Intel Corp. 82547GI Gigabit Ethernet Controller

Benchmark: 
	PARKBENCH low-level pingpong benchmark comms1_mpi

MPI library: 
	Scali MPI (http://www.scali.com/)

Xen distribution: 
	2.0 stable, downloaded with bitkeeper

Xen configuration: 
	default, i.e. we just leave config-2.6.8.1-xen0 the way it is

CPU: 
	Single Intel(R) Pentium(R) 4 CPU 3.40GHz

Memory: 
	1 GB


Bandwidth measurements:

Between two nodes running plain redhat EL3 with kernel 2.4.21-15.EL:

	786.034 MByte/s

Between two nodes each running only xen domain 0:

	56.480 MByte/s

A graph over the measurements - x = message length, y = time:

	http://www.idi.ntnu.no/~havarbj/tmp/plot.png


Cheers,
Havard


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^ permalink raw reply	[flat|nested] 8+ messages in thread
* Re: plan 9 status
@ 2004-10-14  8:10 Keir Fraser
  2004-10-14 15:53 ` Mark A. Williamson
  0 siblings, 1 reply; 8+ messages in thread
From: Keir Fraser @ 2004-10-14  8:10 UTC (permalink / raw)
  To: Ronald G. Minnich; +Cc: Mark A. Williamson, xen-devel, Keir.Fraser

> 
> 
> On Wed, 13 Oct 2004, Mark A. Williamson wrote:
> 
> > I'm curious as to how your source for this port will be distributed...  
> > In fact, I don't know how the p9 source is managed - is it possible for
> > you to get the port checked in to the main tree, or will it be available
> > as a separate patch?
> 
> I have been told I can get it in. There will be issues as the Xen stuff is 
> -- I guess -- GPL and Plna 9 is not, so we're going to get into that 
> damned mess.
> 
> So I don't know how it will go.

Personally, I'm happy to relicense our 'unprivileged guest' drivers
under a BSD-style license. This would include at least the following
files that contain no Linux code:

linux-2.6.8.1-xen-sparse:
 drivers/xen/netfront/*
 drivers/xen/blkfront/*
 drivers/xen/evtchn/*
 drivers/console/*
 arch/xen/i386/mm/hypervisor.c
 arch/xen/kernel/ctrl_if.c
 arch/xen/kernel/evtchn.c
 include/asm-xen/ctrl_if.h
 include/asm-xen/evtchn.h
 include/asm-xen/hypervisor.h
 include/asm-xen/multicall.h
 include/asm-xen/suspend.h

I consider this the least we can do given the lack of documentation
that would allow OS porters to roll their own. :-)

There is the issue that there are bits and pieces of other people's
code in there as well --- e.g., Christian Limpach, Mike Wray, Mark
Williamson. But I don't foresee any problems.

 -- Keir


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^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2004-10-16 20:05 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-10-15 10:48 Xen & I/O in clusters - problems! Håvard Bjerke
2004-10-15 14:02 ` Mark A. Williamson
2004-10-15 16:27   ` Håvard Bjerke
2004-10-16 20:05     ` John Enok Vollestad
  -- strict thread matches above, loose matches on Subject: below --
2004-10-14  8:10 plan 9 status Keir Fraser
2004-10-14 15:53 ` Mark A. Williamson
2004-10-14 17:45   ` Xen & I/O in clusters - problems! Rune Johan Andresen
2004-10-14 18:17     ` Ian Pratt
2004-10-14 23:24     ` Mark A. Williamson
2004-10-15 13:48       ` Rune Johan Andresen

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