29aa313806
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.
Submitted by: Loic Prylli <lprylli@netflix.com>
Reviewed by: jhb
MFC after: 2 weeks
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D20527
|
||
|---|---|---|
| .. | ||
| ipmi_acpi.c | ||
| ipmi_isa.c | ||
| ipmi_kcs.c | ||
| ipmi_linux.c | ||
| ipmi_opal.c | ||
| ipmi_pci.c | ||
| ipmi_smbios.c | ||
| ipmi_smbus.c | ||
| ipmi_smic.c | ||
| ipmi_ssif.c | ||
| ipmi.c | ||
| ipmivars.h | ||