problems at high bandwidth working on getting pathrate and pathload to work on high-bandwidth paths (600Mbps to 1Gbps) pipechar measurements have shown clearly that pipechar does not measure available bandwidth, but rather capacity problematic, since tool claims otherwise both pathrate and pathload have been tested successfully in paths limited by OC-12 (640Mbps) link gigE paths still challenging when network interfaces batch interrupts. we have ideas on how to fix the problem.. more about this at PI meeting in March important for DOE PIs to give us feedback w our tools!