linux-kernel - Re: [PATCH 16/16 v6] PCI: document the new PCI boot parameters

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Message-ID: <20081109141909.GA2458@ucw.cz>
Date:	Sun, 9 Nov 2008 15:19:09 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Greg KH <greg@...ah.com>
Cc:	"Zhao, Yu" <yu.zhao@...el.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"achiang@...com" <achiang@...com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"matthew@....cx" <matthew@....cx>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"rdreier@...co.com" <rdreier@...co.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 16/16 v6] PCI: document the new PCI boot parameters

Hi!

> >>> If we do resource rebalance after system is up, do you think there is any 
> >>> side effect or impact to other subsystem other than PCI (e.g. MTRR)?
> >> I don't think so.
> >>> I haven't had much thinking on the dynamical resource rebalance. If you 
> >>> have any idea about this, can you please suggest?
> >> Yeah, it's going to be hard :)
> >> We've thought about this in the past, and even Microsoft said it was
> >> going to happen for Vista, but they realized in the end, like we did a
> >> few years previously, that it would require full support of all PCI
> >> drivers as well (if you rebalance stuff that is already bound to a
> >> driver.)  So they dropped it.
> >> When would you want to do this kind of rebalancing?  Before any PCI
> >> driver is bound to any devices?  Or afterwards?
> >
> > I guess if we want the rebalance dynamic, then we should have it full -- 
> > the rebalance would be functional even after the driver is loaded.
> >
> > But in most cases, there will be problem when we unload driver from a hard 
> > disk controller, etc. We can mount root on a ramdisk and do the rebalance 
> > there, but it's complicated for a real user.
> >
> > So looks like doing rebalancing before any driver is bound to any device is 
> > also a nice idea, if user can get a shell to do rebalance before built-in 
> > PCI driver grabs device.
> 
> That's not going to work, it needs to happen before any PCI device is
> bound, which is before init runs.

We could run shell from early initrd... And PCI is not required for
initrd, right?

(Ok, I guess this is in we could do it but is it worth the cost?-category...)

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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