MFC r348996 (by jtl):
The current IPMI KCS code is waiting 100us for all transitions (roughly
between each byte either sent or received). However, most transitions
actually complete in 2-3 microseconds.
By polling the status register with a delay of 4us with exponential
backoff, the performance of most IPMI operations is significantly
improved:
- A BMC update on a Supermicro x9 or x11 motherboard goes from ~1 hour to ~6-8 minutes.
- An ipmitool sensor list time improves by a factor of 4.
Testing showed no significant improvements on a modern server by using
a lower delay.
The changes should also generally reduce the total amount of CPU or
I/O bandwidth used for a given IPMI operation.