Re: ia64 emulator or test machine available

From: Darren Williams <dsw_at_gelato.unsw.edu.au>
Date: 2004-11-29 09:11:37
Hi Nick

On Sat, 27 Nov 2004, Nick Piggin wrote:

> Hi,
> 
> I have been doing some work in the area of page table lock reduction
> in collaboration with Christoph Lameter. The main aim of this is to
> improve multi-threaded page fault performance, but may also benefit
> other areas, like multi threded futex performance, and page reclaim.
> 
> I have working implementations on i386 and x86-64, and now I would like
> to get an ia64 version running. For two reasons: first, SGI is pushing
> most of the work in this area, obviously for their ia64 systems;
> 
> second, ia64's implementation of pte access faults in software means
> there is a possibility to implement mutual exclusion for pte access with
> pte lock bits rather than cmpxchg, and with no downside. pte lock bits
> may prove to be more scalable than cmpxchg in some areas.
> 
> With the help of Keith and Christoph, we have a version that is close
> to booting - however I can't ask or expect them to debug my bugs. So if
> anyone is interested in giving me access to an emulator or (preferably)
> machine with serial console and power access that boots recent 2.6
> kernels then I would be much obliged.
> 
> I wouldn't require anything fancy, nor for (hopefully) too long a time.
Possibly the best place to start debugging would be on the Ia64 SKI
simulator, http://www.hpl.hp.com/research/linux/ski/index.php.

Current 2.6 kernel boots and runs. Use 'sim_defconfig' for initial
configuration.

> 
> Thanks,
> Nick
> -
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Darren Williams <dsw AT gelato.unsw.edu.au>
Gelato@UNSW <www.gelato.unsw.edu.au>
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Received on Sun Nov 28 17:11:50 2004

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