Hi,
Agostino just contacted me too and it seems we have already found the
reason.
On Sat, 26 May 2007, ago wrote:
> On Sat, 26 May 2007, Szabolcs Szakacsits wrote:
>
> > Do you use swap file on NTFS too? (Must be totally irrelevant.)
>
> Yes. In fact we were just discussing what to do with it... I might as
> well ask you since you probably know far more than us on that. 3
> options are:
>
> 1 loopmounted file within NTFS seen by kernel as a dedicated swap partition
> 2 file within NTFS seen by kernel as a swap file (swap file inside
> NTFS host folder is mounted inside the ext3 root partition which is in
> a loopmounted file within the NTFS drive)
> 3 file within ext3 / ( / is a loopmounted file within NTFS) seen by
> kernel as a file
>
> We are using 1 at the moment.
Ok, swap file on NTFS is irrelevant only if it's used like below and
loopback isn't involved in any way:
mount -t ntfs-3g physical_device mountpoint
cd mountpoint
dd if=/dev/zero of=swapfile bs=1M count=2000 # 2 GB swap
mkswap swapfile
swapon swapfile
All other ways can deadlock in the kernel the same way people reported.
Bigger the file and less the RAM, the higher the chance.
The swap must be independent of the filesystem otherwise they can end up
waiting for each other. Only the above solution ensures this: after the
successful swapon, the kernel swap subsystem directly accesses the relevant
disk regions, so the mentioned deadlocks can't happen.
I've updated the related ntfs-3g support question with more details:
http://ntfs-3g.org/support.html#swap
Good luck with Wubi! I think it's one of the top important Linux projects,
so feel free to ask whenever you have ntfs-3g related issues, it will be
handled with high priority ;)
Best regards,
Szaka
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