[Samba] vfs_fruit causes delay in listing directories for Windows clients

[Stephan Roth]

Listing directories with many files (10000+) from a Windows client is 
nociceably slower when vfs_fruit is enabled on the samba server compared 
to the same setup without vfs_fruit.

On my setup it's roughly 2.5 times slower. To me it looks like this is 
caused by the getxattr call which is only present with vfs_fruit 
activated and introduces an additional delay of ~ 0.00033 s per listed file.

strace -T reveals the following with vfs_fruit activated:

newfstatat(35, "03915", {st_mode=S_IFREG|0660, st_size=1265, ...}, 
AT_SYMLINK_NOFOLLOW) = 0 <0.000243>
fcntl(20, F_SETLKW, {l_type=F_RDLCK, l_whence=SEEK_SET, l_start=8368, 
l_len=1}) = 0 <0.000010>
fcntl(20, F_SETLKW, {l_type=F_UNLCK, l_whence=SEEK_SET, l_start=8368, 
l_len=1}) = 0 <0.000009>
stat("stroth/testfiles_10000-50000/10000/03915", {st_mode=S_IFREG|0660, 
st_size=1265, ...}) = 0 <0.000312>
getxattr("stroth/testfiles_10000-50000/10000/03915", 
"user.org.netatalk.Metadata", 0x55803d5c9a90, 402) = -1 ENODATA (No data 
available) <0.000348>
listxattr("testfiles_10000-50000/10000/03915", "", 1024) = 0 <0.000345>

a trace of the same directory listing with vfs_fruit disabled is faster 
and doesn't show the getxattr call:

newfstatat(36, "03239", {st_mode=S_IFREG|0660, st_size=303, ...}, 
AT_SYMLINK_NOFOLLOW) = 0 <0.000252>
fcntl(20, F_SETLKW, {l_type=F_RDLCK, l_whence=SEEK_SET, l_start=19600, 
l_len=1}) = 0 <0.000008>
fcntl(20, F_SETLKW, {l_type=F_UNLCK, l_whence=SEEK_SET, l_start=19600, 
l_len=1}) = 0 <0.000007>
stat("stroth/testfiles_10000-50000/10000/03239", {st_mode=S_IFREG|0660, 
st_size=303, ...}) = 0 <0.000419>
listxattr("testfiles_10000-50000/10000/03239", "", 1024) = 0 <0.000355>


My goal with activating vfs_fruit was to speed up directory listings for 
Mac clients, which works. Can the accompanying slowdown for Windows 
clients be avoided?

Thank you for any insights,
Stephan