Copy files from 99% to 100% will take a long time

[yaoxuwan]

Bug Report

Copying a file from //memfs64/share to desktop will take a long time from 99% to 100%

Environment

• OS version and build: Windows Server 2022 Datacenter 21H2 20348.1850
• WinFsp version and build: 2.0.23075

filespy

FileSpy.txt

[billziss-gh]

What does the diag.bat script (found under \Program Files (x86)\WinFsp\bin) report? I am particularly interested in the filters that are installed on this system.

[yaoxuwan]

FILE SYSTEM FILTERS (REQUIRES ADMINISTRATOR)

筛选器名称 数字实例 高度 框架

---

bindflt 0 409800 0
SysmonDrv 3 385201 0
TxProcessMon 3 370065 0
txaudit 2 370030 0
WdFilter 3 328010 0
iOAMonitor 3 327123 0
iOAAudit 3 327120 0
storqosflt 0 244000 0
wcifs 0 189900 0
CldFlt 0 180451 0
FileCrypt 0 141100 0
luafv 1 135000 0
npsvctrig 1 46000 0
Wof 1 40700 0

[billziss-gh]

It seems you have some third party filters:

• SysmonDrv and TxProcessMon: These seem to be part of sysinternals and they should not cause any problems.

• txaudit: I am unsure what this filter is as I cannot find any relevant information online. It does not seem to be part of the standard Windows ones.

• iOAMonitor and iOAAudit: These seem to be filters associated with crowdstrike products, which may be incompatible with WinFsp.

My suggestion would be to try your scenario without the crowdstrike product and see if the problem persists.

[yaoxuwan]

The problem persists after remove third-part filters.

FILE SYSTEM FILTERS (REQUIRES ADMINISTRATOR)

筛选器名称 数字实例 高度 框架

---

bindflt 0 409800 0
SysmonDrv 3 385201 0
WdFilter 3 328010 0
storqosflt 0 244000 0
wcifs 0 189900 0
CldFlt 0 180451 0
FileCrypt 0 141100 0
luafv 1 135000 0
npsvctrig 1 46000 0
Wof 1 40700 0