Chuck Lever <cel <at> citi.umich.edu> writes: > Create a new file under /proc/self, called mountstats, where mounted file > systems can export information (configuration options, performance counters, > and so on). Use a mechanism similar to /proc/mounts and s_ops->show_options. I'm using this file to dump data into our performance metrics database along with all the other counters from snmp and other sources. This lets us calculate things like the average number of requests pending, average latency per request over time. But I have a few questions about the meaning of the values and they don't seem to be documented outside the comments in the source. In particular is it an invariant that execution = rtt + queue? Or is execution including some additional overhead other than the server and network congestion? Or is there something more subtle going on and these values aren't related in the way I'm imagining at all? And where can I read about the meaning of bad_xids, req_u, and bklog_u? What do they mean? Also, connect_time, idle_time, req_u, and bklog_u are instantaneous samples ("guages" so to speak), not integrated over time right? So they can't be used to calculate any aggregates? -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html