On 7/15/07, Luca <[EMAIL PROTECTED]> wrote:
> On 7/15/07, Luca <[EMAIL PROTECTED]> wrote:
> > On 7/13/07, Dave Hansen <[EMAIL PROTECTED]> wrote:
> > > diff -ru kvm-fast-dmesg.txt kvm-slow-dmesg.txt
> > >
> > > Linux version 2.6.22 ([EMAIL PROTECTED]) (gcc version 4.1.2 (Ubuntu
> > > 4.1.2-0ubuntu4)) #13 Wed Jul 11 15:27:01 PDT 2007
> >
> > Is this a vanilla 2.6.22? 32 bit?
> >
> > > @@ -107,20 +90,21 @@
> > > PIIX3: IDE controller at PCI slot 0000:00:01.1
> > > PIIX3: chipset revision 0
> > > PIIX3: not 100% native mode: will probe irqs later
> > > -PIIX3: neither IDE port enabled (BIOS)
> > > + ide0: BM-DMA at 0x1400-0x1407, BIOS settings: hda:pio, hdb:pio
> > > + ide1: BM-DMA at 0x1408-0x140f, BIOS settings: hdc:pio, hdd:pio
> >
> > Hum, FC6 PIIX driver always comes up with the same mode, regardless of
> > what I'm doing to the controller...
>
> Ok, now I'm confused...
>
> pci_config_write: PIIX3 IDE: addr=40 val=00008000 len=2
> pci_config_write: PIIX3 IDE: addr=42 val=00008000 len=2
>
> I'm using KVM-27 userspace, and the BIOS is enabling both ports. So...
> linux shouldn't think that the ports are disabled (yet I saw the same
> thing with FC7 and libata).
Oh fuck, it's obvious... If you don't supply -L on the command line
KVM ends up using the BIOS in the default system directory
(/usr/share{,local}/qemu); on my system this the BIOS installed by
QEMU 0.9, which does *not* enable the IDE ports. OTOH the BIOS file
shipped with KVM does enable the ports.
I guess that you're seeing the same thing: you used to run KVM+QEMU
bios (ports disabled - fast); then KVM started to enable IDE ports
(even with QEMU bios) and you saw a regression.
Can you re-test KVM 27 with it's BIOS (i.e. use something like -L
~/src/kvm-27/qemu/pc-bios)?
FYI I'm seeing a better tput with MWDMA2 (ports enabled) rather than
with PIO (ports disabled).
Luca
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