Messages in this thread | | | Date | Mon, 28 Feb 2022 05:57:27 -0800 | Subject | Re: [PATCH v2 0/2] ic2: mux: pca9541: add delayed-release support | From | Guenter Roeck <> |
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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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