https://bugzilla.kernel.org/show_bug.cgi?id=109391 Bug ID: 109391 Summary: Packet and byte counters only 32bit Product: Drivers Version: 2.5 Kernel Version: git HEAD Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Infiniband/RDMA Assignee: drivers_infiniband-rdma@xxxxxxxxxxxxxxxxxxxx Reporter: philipp.marek@xxxxxxxxxx Regression: No Trying to find packet and byte counters for the RDMA transports I stumbled upon this directory: /sys/class/infiniband/mlx5_1/ports/1/counters/ This seems to have all the requested data; but, looking again, I can see port_rcv_data: 4294967295 which looks awful. And indeed, in https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/infiniband/core/sysfs.c#n401 there's a 32bit width, with explicit code in https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/infiniband/hw/qib/qib_mad.c#n1507 to cap on that limit... That is useless for the upcoming speeds. The MLX5 driver can drive Connect-X4 cards which go 100GBit/sec; that is 11GByte/sec, which means that the 32bit counter will overflow ~3 times a second. So it can't be monitored. Please provide 64bit counters (for packets and bytes, at least)! Thanks a lot. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
