Copy a large directory to the SAMBA shared directory - windows

Question

description
When I try to create more than 100,000 files in the SAMBA shared dir, the smbd cpu usage increases as the number of files increases and performance degrades. I look at the smbd log, before the creation of each document will receive from the client SMB2_FIND request, the request parameters in_file_name = "*", used to obtain the entire directory of information. That is to say that each file needs to create a whole directory of information, with the increase in the number of sub-files, performance significantly decreased. I would like to ask is whether the SMB protocol to consider the use of a large number of documents under the directory scene, smbd there is no way to optimize, or modify the configuration can improve performance?
test environment
client: windows8
server: centos7.1
smbd version:
[root#localhost samba]# ps aux | grep smbd
root 3378 0.0 0.3 386040 5800 ? Ss 20:43 0:00 /usr/sbin/smbd
root 3380 0.0 0.1 386040 3108 ? S 20:43 0:00 /usr/sbin/smbd
root 3385 0.0 0.3 390600 7004 ? S 20:44 0:00 /usr/sbin/smbd
root 3504 0.0 0.0 112648 976 pts/0 R+ 21:09 0:00 grep -- color=auto smbd
[root#localhost samba]# /usr/sbin/smbd --version
Version 4.2.10
test procedure
modify smb.conf
[root#localhost samba]# testparm -s -c
Load smb config files from /etc/samba/smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Processing section "[1111]"
Loaded services file OK.
Server role: ROLE_STANDALONE
[global]
workgroup = MYGROUP
server string = Samba Server Version %v
security = USER
log file = /var/log/samba/log.%m
max log size = 900000000
server max protocol = SMB2
idmap config * : backend = tdb
[1111]
comment = share
path = /tmp
read only = No
restart smbd service
[root#localhost samba]# service smb restart
Redirecting to /bin/systemctl restart smb.service
map a directory to a network disk
Write the test program
var writewg sync.WaitGroup
var i uint64
for i = 0; i < files; i++ {
writewg.Add(1);
ctx.sem <- true
go func(index uint64) {
if isdir {
subdir := path + "/dir_" + strconv.FormatUint(index, 10)
os.MkdirAll(subdir, 0777)
} else {
file := path + "/file_" + strconv.FormatUint(index, 10)
f, err := os.OpenFile(file, os.O_CREATE|os.O_APPEND|os.O_RDWR, os.ModePerm|os.ModeTemporary)
if err != nil {
fmt.Println("OpenFile ", file, " failed ", err );
} else {
f.Write(ctx.data[0:])
f.Close()
}
}
atomic.AddUint64(&ctx.task.Ops, 1)
<- ctx.sem
writewg.Add(-1)
}(i)
}
writewg.Wait()
run my test program
create 500 files
View the log
[root#localhost samba]# grep "smbd_dirptr_get_entry mask=.*file_0" log.xjl | wc -l
500
[root#localhost samba]# grep "SMB2_OP_FIND" log.xjl | wc -l
1020