Re: [RFC/PATCH, 2/4] readX_check() performance evaluation

[Andi Kleen]

On Wed, 28 Jan 2004 14:21:40 -0800 (PST)
Linus Torvalds <torvalds@xxxxxxxx> wrote:

> 
> 
> On Wed, 28 Jan 2004, Andi Kleen wrote:
> > 
> > I have no idea how to do such an synchronization on i386/x86-64. E.g. Opteron
> > chipsets would likely support MCEs for bus aborts, but there is no way to 
> > synchronize it for writes.
> 
> Doing a status read from the device should do it (just read the config 
> space, for example).

The device is just not known. iirc you only get a bit in the bridge, which
leaves a wide choice. Ok, I guess you could read all config spaces in this
case

(I don't remember the ordering rules well enough - maybe one single config
space read is enough for all devices behind the bridge) 

> But remember: I suspect there are very _very_ few people who care at that 
> stage. 

Driver writers caring would be a good start.

I definitely agree that it shouldn't be enabled on anything near a production kernel.

-Andi
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