[openib-general] sysfs exposure of port counters useless?

[Rimmer, Todd]

> From: Michael Newton
> Sent: Tuesday, October 17, 2006 3:02 AM
> To: openib-general at openib.org
> Subject: [openib-general] sysfs exposure of port counters useless?
> 
> 
> These are 32 bit counters. The rcv/xmit_data counters count 32-bit
> blocks. Also, these counts do not wrap: they peg at all 1s.
> At infiniband speeds, these counts can peg out very quickly indeed,
> to the point they can really only be of use if they can be reset each
time
> there read. Now if anyone who wants to use them has to go the CLI to
reset
> them, and theres little point in reading them without reset, why would
> anyone read them via sysfs? so why have them?
> 

We have found that while your comment is true for the data movement
counters, the error counters should not peg quickly, hence it is valid
to read them without resetting.  However it is also useful to have an
ability to reset them.  Of course if there are other CLI commands which
do this easily, the sysfs info is of less value.

Todd Rimmer