Hi,
I run OpenBSD 3.7 on a i686 box and discovered following problem using it as
an nfs client.
Scenario:
NFS Server: GNU/Linux (Debian unstable), Athlon 1.3GHz, kernel 2.6.11.10,
kernelspace nfs server, NFSv3 enabled, TCP disabled.
NFS Client 1: OpenBSD 3.7 on a P3-733MHz, NFSv3, UDP, generic kernel
NFS Client 2: GNU/Linux (Arch current), AthlonXP 3200+, kernel 2.6.11.x
All computers are connected to a local private ethernet network.
Simple test case: (using the OpenBSD box)
cp /mnt/nfs_share/path_to_file/source_file /localdisk/path/target_file
where sizeof (source_file) > 2^32 bytes
Observed behaviour:
( sizeof( source_file ) - sizeof( target_file ) )
= 2^32 bytes
!=sizeof( source_file )
Example: A file copied from the nfs mount with a size of 4,428,851,200 bytes
results in a copy that has a size of 133,883,904 bytes.
4,428,851,200 - 133,883,904 = 4,294,967,296 = 2^32
2nd test case (using the OpenBSD box):
cp /mnt/nfs_share/path_to_file/source_file /localdisk/path/target_file
where 2^31 bytes < sizeof (source_file) <= 2^32 bytes
Observed behaviour:
sizeof ( target_file ) = 0 bytes
Example: A file copied from the nfs mount with a size of 3,363,543,040 bytes
results in a copy that has zero bytes size without getting an error message
from cp.
X-check test case (using the GNU/Linux NFS client):
Repeat test cases 1 and 2.
Observed behaviour: Everthing works as it should, file copies are complete,
md5sums and file sizes of original and copy match.
Further notes:
Similiar problems could be observed with other userland programs that are
reading a file from the nfs mount, e.g. a BitTorrent client downloading a
torrent containing a sufficiently large file, or using wget to download a
large file onto the nfs mount.
Writing, however, does not seem to be affected, cp'ing a large file onto the
nfs share works. Dealing with very large files on the OpenBSD box locally did
not reveal anything problematic, either.
/etc/fstab line for the nfs mount is:
machine_name:/path /mnt/mountpoint nfs noauto,rw,noexec,nodev,nosuid 0 0
(real names and paths substituted with generic terms)
Advice is appreciated.
Regards,
Dominik
--
The duration of passion is proportionate with the original resistance
of the woman.
-- Honor'e DeBalzac
