Re: [Qemu-devel] smp support and ide lba48

[Jens Axboe]

On Mon, Mar 13 2006, Mario Goppold wrote:
> Am Samstag, 11. März 2006 13:31 schrieb Jens Axboe:
> > On Fri, Mar 10 2006, Mario Goppold wrote:
> > > Hi,
> > >
> > > I try to install SuSE92-64 on an 400G HD but it fails:
> > >
> > > hda: max request size: 128KiB
> > > hda: cannot use LBA48 - full capacity 838860800 sectors (429496 MB)
> > > hda: 268435456 sectors (137438 MB) w/256KiB Cache, CHS=65535/16/63,
> > > (U)DMA hda:<4>hda: lost interrupt
> > > hda: lost interrupt
> > > ...
> > >
> > >
> > > If I switch to 32bit (in grub) it works. Here is my Env:
> > >
> > > Qemu: snapshot20060304 (gcc version 3.3.6)
> > > KQemu: kqemu-1.3.0pre3 (gcc version 4.0.2, SuSE10.0, 2.6.13-15.8-smp)
> > >
> > > qemu-img create test.img 400G
> > > qemu-system-x86_64 -m 512 -k de -localtime -smp 2 \
> > >  -net nic,vlan=0,macaddr=00:01:02:03:04:05 -net tap,vlan=0 \
> > >  -hda test.img -cdrom /dev/dvd -boot d
> > >
> > > If I reduce the image-size it won't better.
> > >
> > > Yust now I try it without "-smp 2" and see what I want "unkown partition
> > > table ..."
> > >
> > > So my question is : Is lba48 not smp save or is smp support broken (or
> > > incomplete)?
> >
> > lba48 support is not committed yet, read the linux messasge - it says it 
> > cannot use lba48, because the drive (qemu) doesn't support it. Find my
> > latest posting on this list, it should get you going.
> 
> Oh, i oversight that the patches not commited yet. Now i have the patches to 
> the snapshot_2006-03-12 adapted (Patch 2/3 and 3/3 of your Mail from 
> 4.1.2006) and applied but with no succsess:
> 
> hda: max request size: 128KiB
> hda: 838860800 sectors (429496 MB) w/256KiB Cache, CHS=52216/255/63, (U)DMA
> hda: lost interrupt
> hda: lost interrupt
> hda: lost interrupt
> hda: lost interrupt
>  hda:<4>hda: dma_timer_expiry: dma status == 0x24
> hda: DMA interrupt recovery
> hda: lost interrupt
> ...

So now you see the full drive size and linux can use it, however there
seems to be an unrelated problem with interrupt delivery in smp mode. I
can't say what causes that, other 'devices' will likely show the same
problem.

-- 
Jens Axboe