In article <2b5e566d0809171014lb241f9am45250af2a366b128@xxxxxxxxxxxxxx> you wrote: > TCPLossUndo counter is being incremented when some errors occur. AFAIK this shows a reordering problem. (missing segments coming in late). Are you using multi path, bonding or strange switch topologies? The most reliable way to check out those extended TCP statistics is (unfortunatelly) the kernel source. But that most often requires expert know how on those algorithms (like selective acknowledgments, retransmits, reno, congestion control, undo window reduction, etc). That saied, it might be an actual implementation problem of this code path. Gruss Bernd -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html