OpenSolaris

statvfs (statvfs64) is unacceptably slow while large files are beeing freed in the background on logging UFS.

Tests I've performed on a modest x86 system shows df hanging in statvfs64 for around 15 seconds after deleting some large files while UFS is freeing the blocks.

If I mount the filesystem "nologging", it takes just fractions of a second.

My tests were performed on a simple 40G UFS filesystem mounted on /mnt:
---
cd /mnt
mkfile 5g a b c
lockfs -f /mnt
rm a b c
---

In another window I ran "truss df -D /mnt".

Before the rm:

spiff:~ (361)> truss -D df /mnt
...
 0.0004 resolvepath("/mnt", "/mnt", 1024)               = 4
 0.0003 statvfs64("/mnt", 0x0804725C)                   = 0
...

This statvfs64 took just 300µs.

After the rm:

spiff:~ (362)> truss -D df /mnt
...
 0.0003 resolvepath("/mnt", "/mnt", 1024)               = 4
14.9443 statvfs64("/mnt", 0x0804725C)                   = 0
...

This statvfs64 took almost 15 seconds.

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