On 2/17/25 11:58, Lucas Stach wrote: > Hi Luke, > > Am Montag, dem 17.02.2025 um 19:06 +0800 schrieb ziniu.wang_1@xxxxxxx: >> From: Luke Wang <ziniu.wang_1@xxxxxxx> >> >> Compared with kernel 6.1, imx8mq eMMC/SD read performance drops by about >> 30% with kernel 6.6. >> >> The eMMC/SD read thread will be put to sleep until the hardware completes >> data transfer. Normally, the read thread will be woken up immediately >> when the data transfer is completed. However, due to a known ic bug, if >> imx8mq is in cpuidle, it will take a long time (about 500us) to exit >> cpuidle. As a result, the read thread cannot immediately read the next >> data block, affecting the read performance. >> > Is this really a problem with the upstream kernel? i.MX8MQ upstream > does not use the deeper PSCI idle states, but only uses WFI, so I doubt > that upstream is affected by this issue. > > Regards, > Lucas Furthermore if that were to be the case the correct solution would probably to have that reflected in the dts, too?
