Re: [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support

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On 2/28/22 00:43, Zev Weiss wrote:
On Mon, Jan 31, 2022 at 04:18:08PM PST, Zev Weiss wrote:
Hello,

This series adds support for a new pca9541 device-tree property
("release-delay-us"), which delays releasing ownership of the bus
after a transaction for a configurable duration, anticipating that
another transaction may follow shortly.  By avoiding a
release/reacquisition between transactions, this can provide a
substantial performance improvement for back-to-back operations -- on
a Delta AHE-50DC (ASPEED AST1250) system running OpenBMC with dozens
of LM25066 PMICs on PCA9541-arbitrated busses, a setting of 10000 (10
ms) reduces the median latency the psusensor daemon's hwmon sysfs file
reads from 2.28 ms to 0.99 ms (a 57% improvement).


Ping...Guenter, any thoughts on this?


It sounds reasonable to me, but I don't have access to hardware anymore
to test it, so I have no means to confirm that it actually works.

Guenter




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