https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258204
Bug ID: 258204
Summary: Extremely poor performance copying directory with lot
small files on nvme
Product: Base System
Version: 13.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Copying over a folder with lot of small files takes a lot of time
time cp -r /usr/src/sys /home/ali/sys
173.58 real 0.00 user 0.90 sys
/dev/gpt/freebsd-root / ufs rw,noatime 2 2
/dev/gpt/freebsd-boot /bootfs ufs rw 1 1
/dev/gpt/freebsd-swap none swap sw 0 0
/usr/src/sys contains ~500M of data.
The problematic system is a T495 with nvme device. On the same machine, I
tested copying the same amount of data on OpenSUSE 15.3 with xfs root
partition, and it takes around 1.5 seconds.
While copying, I see that the 'cp' command spends a lot of time on biord/biowr.
I did a test copying a single large file of 500M, and it impressively fast.
Please let me know if you need more data.
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