[Bug 230260] [FUSE] [PERFORMANCE]: Performance issue (I/O block size)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230260

Kenneth D. Merry <ken at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ken at FreeBSD.org

--- Comment #9 from Kenneth D. Merry <ken at FreeBSD.org> ---
This breaks LTFS (https://github.com/LinearTapeFileSystem/ltfs) at least.  For
example:

sm4u-12:/mnt:!:0} dd if=/dev/zero of=foo bs=1m count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 5.713798 secs (187920873 bytes/sec)
{sm4u-12:/mnt:!:0} ls -la
total 1048578
drwxrwxrwx   2 root  wheel           0 Feb 19 22:20 .
drwxr-xr-x  30 root  wheel          35 Jan 30 18:45 ..
-rwxrwxrwx   1 root  wheel  1073741824 Feb 19 22:20 foo
{sm4u-12:/mnt:!:0} dd if=foo of=/dev/null bs=1m
0+1 records in
0+1 records out
65536 bytes transferred in 0.000146 secs (449912127 bytes/sec)
{sm4u-12:/mnt:!:0} ls -la
total 1048578
drwxrwxrwx   2 root  wheel           0 Feb 19 22:20 .
drwxr-xr-x  30 root  wheel          35 Jan 30 18:45 ..
-rwxrwxrwx   1 root  wheel  1073741824 Feb 19 22:20 foo

Reverting the change back to 4K makes reads work normally again.

I wonder how many other filesystems were broken by this change?

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