# MCU 'mcu' shutdown: Rescheduled timer in the past - Host Buffer 100% **URL:** \ **Category:** General Discussion\ **Created:** [October 11, 2022, 12:04pm UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-rescheduled-timer-in-the-past-host-buffer-100/4442 "2022-10-11T12:04:36Z")\ **Posts on this page:** 3\ **Page:** 2
**Author:** ![Hundsbuah](https://avatars.discourse-cdn.com/v4/letter/h/839c29/32.png) [@Hundsbuah](https://klipper.discourse.group/u/Hundsbuah)\ **Post date:** [October 16, 2022, 5:09pm UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-rescheduled-timer-in-the-past-host-buffer-100/4442/21 "2022-10-16T17:09:01Z")
**without -O3 and the armv7e optimizations ( std. Makefile in github repo ):** _ **1 stepper:** _ _lowest ticks: 44_ _ **3 stepper:** _ _lowest ticks: 198_ **with -O3 and the armv7e optimizations ( `-mtune=cortex-m7 -march=armv7e-m+fp.dp -mcpu=cortex-m7` ):** _ **1 stepper:** _ _lowest ticks: 42_ _ **3 stepper:** _ _lowest ticks: 192_ ---
**Author:** ![koconnor](https://avatars.discourse-cdn.com/v4/letter/k/aca169/32.png) [@koconnor](https://klipper.discourse.group/u/koconnor)\ **Post date:** [October 22, 2022, 12:41am UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-rescheduled-timer-in-the-past-host-buffer-100/4442/22 "2022-10-22T00:41:36Z")
Thanks. The master Klipper branch has been updated to enable the cache on stm32h7 mcus (commit 00191b5c). -Kevin ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [August 16, 2024, 6:05am UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-rescheduled-timer-in-the-past-host-buffer-100/4442/23 "2024-08-16T06:05:11Z")
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