All of the accounts, except very limited amount, are in LDAP, and as I can see user information is identical on server and client. As for my tests, below are all the details. Difference in speed while copying a lot of small files is _huge_... I'd appreciate if somebody more familiar with NFS/kerberos combination can provide a kind of explanation. Regards, Vlad. * Local directory is /mnt/data/tmp/coreboot/src # find x86/ | wc -l 296 # du -csh x86 1.5M x86 1.5M total * First try without kerberos: grep /mnt/tmp/ /proc/mounts nfs:/mnt/tmp /mnt/tmp nfs rw,noatime,vers=3,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.219,mountvers=3,mountport=32767,mountproto=tcp,local_lock=none,addr=192.168.1.219 0 0 # time cp -i -arv /mnt/data/tmp/coreboot/src/arch/x86 /mnt/tmp/x86 cp -i -arv /mnt/data/tmp/coreboot/src/arch/x86 /mnt/tmp/x86 0.01s user 0.04s system 10% cpu 0.476 total * Second try with kerberos: grep /mnt/tmp/ /proc/mounts nfs:/mnt/tmp /mnt/tmp nfs rw,noatime,vers=3,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=krb5,mountaddr=192.168.1.219,mountvers=3,mountport=32767,mountproto=tcp,local_lock=none,addr=192.168.1.219 0 0 # time cp -i -arv /mnt/data/tmp/coreboot/src/arch/x86 /mnt/tmp/x86 cp -i -arv /mnt/data/tmp/coreboot/src/arch/x86 /mnt/tmp/x86 0.01s user 0.07s system 0% cpu 23.294 total At the same time test with a single file (621M): * without kerberos: cp -i -av /mnt/media/images/GNOME_3.x86_64-0.2.0-Build1.1.iso 0.00s user 0.69s system 5% cpu 13.521 total * with kerberos: cp -i -av /mnt/media/images/GNOME_3.x86_64-0.2.0-Build1.1.iso 0.00s user 0.55s system 2% cpu 26.299 total With the same file, but with "dd if=/mnt/media/images/GNOME_3.x86_64-0.2.0-Build1.1.iso of=/mnt/tmp/test.iso bs=32M" gives: * without kerberos: 651165696 bytes (651 MB) copied, 10.7168 s, 60.8 MB/s * with kerberos: 651165696 bytes (651 MB) copied, 24.6176 s, 26.5 MB/s On Tue, 2011-06-07 at 19:07 -0400, J. Bruce Fields wrote: > On Fri, Jun 03, 2011 at 07:57:16PM +0200, Vladimir Elisseev wrote: > > There's no mount command involved in timing. It's simply copy of the > > same directory (with many small files to NFS share with and without > > sec=krb5 mount option. > > Weird. > > I wonder if the krb5 principal is being mapped to a different user on > the server side, and that's making some difference. > > Still, could you give us the full details? (Exactly what commands are > you running, what results do you see?) > > --b. > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
