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Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2

From: Kevin O'Connor
Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?
Date: Wed, 4 Aug 2010 18:41:07 -0400
User-agent: Mutt/1.5.20 (2009-12-10)

On Wed, Aug 04, 2010 at 06:01:54PM +0300, Gleb Natapov wrote:
> On Wed, Aug 04, 2010 at 09:50:55AM -0500, Anthony Liguori wrote:
> > On 08/04/2010 09:38 AM, Gleb Natapov wrote:
> > >ROM does not muck with the e820. It uses PMM to allocate memory and the
> > >memory it gets is marked as reserved in e820 map.

Every ROM is implemented differently - there's no way to really know
what they'll do.

> > PMM allocations are only valid during the init function's execution.
> > It's intention is to enable the use of scratch memory to decompress
> > or otherwise modify the ROM to shrink its size.
> > 
> Hm, may be. I read seabios code differently, but may be I misread it.

There is a PCIv3 extension to PMM which supports long term memory
allocations.  SeaBIOS does implement this.  The base PMM spec though
only supports memory allocations during the POST phase.


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