fsync performance

If anyone has a few seconds spare, could you please run the following and post the results: dd if=/dev/zero of=test.bin bs=512 count=128 oflag=sync along with the kernel version and arch, filesystem, layers (lvm, md, etc), and underlying hardware? When I do it on a bare 7200RPM sata disk on a modern server running xfs I get 10-15kbytes/second. I've repeated this on 3 other servers on different hardware with similar results, but when I do it on a ~10yo PC with ext3 I get around 500kbytes/second - 50x faster. I suspect it might be the kernel version (3.8 on new server, 2.6 on old pc) and the implementation of O_SYNC in older kernels wrt metadata but I don't have enough data points to form any conclusions... Thanks James