Xiaomi magazine buffer: optimal size, inspection and cleaning

The log buffer (or log buffer) in Xiaomi smartphones is a hidden system area where data about application performance, system errors and debugging information is temporarily stored. Many users face the problem of overflowing this buffer, which leads to a slowdown of the device, sudden reboots or even blocking access to certain functions. But how do you know how big the log buffer is on your Xiaomi model and when it needs to be cleaned?

In this article, we will understand where the journal buffer is stored, how to check its current size, what values are considered normal for different versions. MIUI, And what to do when the log buffer is full, and you'll learn how to safely clean the log without losing important data or disrupting the system, and we'll focus on the differences between Qualcomm and Mediatek chipset models, because they have different approaches to managing logs.

What is a magazine buffer in Xiaomi and why you need it?

The log buffer is a specialized memory area where the Android operating system and MIUI record:

• 🔹 System Events (Service Start/Stop, Setting Changes)
• 🔹 Application errors (coloring, hanging, incorrect operations)
• 🔹 Debugging data (kernel logs, interaction with iron)
• 🔹 Network activity (connections to Wi-Fi, mobile network, Bluetooth)

This data is used:

• 🛠️ Developers to diagnose problems in firmware or applications.
• 🤖 System for automatic recovery after failures.
• 🔍 Service centers during the repair of the device.

However, over time, the buffer may become overflowing, especially if:

• 📱 There are many applications that actively write logs (for example, messengers or games).
• 🔄 System or application failures often occur.
• 📡 Developer mode activated with debugging enabled USB.

⚠️ Attention: A crowded log buffer can cause a smartphone to slow down, spontaneous reboots and even loss of network connectivity.In extreme cases, the device may stop booting, requiring a reset via Fastboot.

Standard magazine buffer sizes for different Xiaomi models

The size of the journal buffer depends on several factors:

• 📅 Versions MIUI (In new firmware buffers often increase).
• 🧠 Processor type (Qualcomm usually allocates more memory to logs than Mediatek).
• 📱 Device lines (flagships have a larger buffer than budget models).

Below is a table with typical magazine buffer sizes for popular Xiaomi models (values may vary slightly depending on regional firmware):

Important: On Qualcomm chipset devices, the magazine buffer often expands dynamically when needed, whereas on Mediatek it is tightly limited, which means you’ll experience less overflow on Snapdragon models, but it may take longer to clean up.

If your model is not listed in the table, the size of the buffer can be found through the developer mode or special applications (more about this in the next section).

How to check the current magazine buffer size on Xiaomi

There are several ways to know how much space the log buffer takes up on your device, and let's take them in order, from the simplest to the more technical.

Method 1: Through the "Storage" menu in the settings

This method works for most devices with MIUI 12 and newer:

1. Open the Settings → Storage.
2. Tap on "Other" or "System Data" (depending on version) MIUI).
3. Find the item "System logs" or "Logs" - here will be the volume occupied.

Method 2: Using the Security App

In some firmware, log data is hidden in the Security app:

1. Launch the Security app (the shield icon).
2. Go to Optimization. → Deep cleaning.
3. In the list of garbage, find "System Logs" - next to them will be indicated their size.

Method 3: Through ADB (for advanced users)

If the first two methods don’t work, you can use Android Debug Bridge (ADB):

adb shell dumpsys -l | grep "log"

This command will list the log-related services and their current size. For more information, use:

adb shell logcat -g

Please note: for the purpose of working with ADB I need to get the debugging on. USB developer-setting.

⚠️ Note: If, during the inspection, ADB If you see a buffer size of over 500MB, this is a sign of a serious overflow, in which case it is recommended to immediately clear the logs or reset the cache via Recovery.

How to Clean a Xiaomi Magazine Buffer Without Losing Data

If the log buffer is full, there are a number of ways you can clean it up, starting with the safest and ending with radical measures.

Method 1: Cleaning through the "Storage" menu

The easiest way, which does not require additional tools:

1. Go to Settings. → Warehouse → Others.
2. Put it on System logs or Logs.
3. Click "Clear" and confirm the action.

This method only removes user logs without affecting critical system data.

Method 2: Use of the Security App

If there is no item with logs in the storage menu, try:

1. Open the Security app.
2. Choose Optimization. → Deep cleaning.
3. Check "System Logs" and click "Clear".

Method 3: Cleaning with Recovery Mode

If the phone is slowing down and does not respond to commands, cache reset via Recovery will help:

1. Turn off the device.
2. Press the Power button + Volume up until the MI logo appears.
3. From the Recovery menu, select "Wipe & Reset" → Wipe Cache".
4. Confirm the action and restart the phone.

Important: This method does not delete user data, but resets all temporary files, including logs.

Method 4: Manual deletion of logs through ADB (skilled)

If previous methods did not help, you can manually clean the log buffer through the ADB:

adb shell su


rm -rf /data/log/*




rm -rf /cache/log/*




logcat -c

These commands require root rights (most Xiaomi have them disabled by default) without root access, the cleanup will be incomplete.

⚠️ Attention: Misuse of the right ADB If you're not sure what you're doing, you'd better use the first or second method.

💡

If after cleaning the magazine buffer the phone still brakes, try to disable debugging by USB In the developer settings - this will reduce the number of logs recorded.

What to do if the magazine buffer is constantly overflowing

If you regularly experience a magazine buffer overflow, this may indicate:

• 🐞 Failures in the firmware (especially if the custom or beta version is installed) MIUI).
• 📦 Problem applications that actively write logs (most often messengers, games or applications with background services).
• 🔧 Active debugging (if the developer mode with debugging is enabled) USB).

Here's what we can do:

1. Update the firmware to the latest version

In the new versions MIUI They often optimize logs. Check for updates:

1. Settings → About the phone → System update.
2. If an update is available, install it and restart the device.

2. Find and remove problematic applications

Some applications may over-fill the log buffer to identify them:

1. Install the Logcat Reader app from Google Play.
2. View the logs in real time – the apps that generate the most records will be visible immediately.
3. Remove or update problematic programs.

3. disable unnecessary system services

Certain functions MIUI They're actively logging:

• 📡 "Network enhancement” (Settings → SIM-maps and mobile networks → Improvement of the network).
• 🔍 "Analytics MIUI" (Settings → Additionally. → Analytics and improvements).
• 🎮 "Turbo mode (unless you play heavy games).

4. Reset the settings to factory (last resort)

If nothing helps, do a hard reset:

1. Save all important data (photos, contacts, messages).
2. Go to Settings → About the phone → Reset settings.
3. Select "Reset all settings" and confirm.

It’s a radical method, but it’s guaranteed to clear all logs and return the phone to its original state.

💡

If the log buffer overflows more than once a month, it's not normal, and it's probably the firmware or one of the apps that's installed that's the problem.

Can I increase the size of the magazine buffer on Xiaomi?

By default, the log buffer size is rigidly set in Android system files and MIUI. In some cases, it can be increased, but this will require:

• 🔓 Root rights (unlocked bootloader and installed Magisk).
• 📝 Editing system files (for example, /system/build.prop).
• 💻 Knowledge of teams ADB kernel-modification.

If you have root access, you can try the following:

Method 1: Change the settings in build.prop

Open the file. /system/build.prop in a text editor (for example, through Root Explorer) and add lines:

logcat.size=16m


logcat.rotate=4

Where:

• logcat.size is the maximum size of a single log file (in megabytes).
• logcat.rotate – the number of backups of logs.

Method 2: Using Magisk modules

Magisk repository has modules that automatically adjust the size of the log buffer.

• Logcat Buffer Resizer allows you to flexibly adjust the size of the logs.
• Systemless Logcat optimizes log recording without changing the system partition.

After installing the module, restart the phone and check the new buffer size through ADB:

adb shell logcat -g

⚠️ Warning: Incorrectly editing build.prop or installing incompatible Magisk modules can lead to bootloop ( looped reboot). TWRP.

Frequent questions about Xiaomi magazine buffer