Jonathan T. Looney 1524298754 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. Submitted by: Loic Prylli <lprylli@netflix.com> Reviewed by: jhb MFC after: 2 weeks Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D20527		2019-06-12 16:06:31 +00:00
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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