[Samba] Speedup windows client [was] What is the maximum speed for download from a samba share

[Knut Krüger]

Am 25.04.2018 um 09:56 schrieb L.P.H. van Belle via samba:
> As counter example.
> My slowest server, AMD E350 2 core, max 1.6Gz.
> On 1Gb lan, disk 2x 5400rpm software raid 1 + 1 ssd.
>
> Copy Speed 115Mb/s as in max 1Gb bandwith, from a win7 and win10 pc to the raid1.
>
> File sizes.
> 100Mb+ get max 115Mb/s 		to a 4MB blocksized partition.
> 1-10mb files ,max 90-115Mb/s 	 to a 1MB blocksized partition.
> 0.0-1mb files  ,max 60-100Mb/s to a 4k blocksized partition.
>
> I get these speeds while im watching my kodi. ;-)  Samba 4.6.x on ubuntu 17.10
> One note here, i use kernel 4.16.1 from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=M;O=D
> Thats mostly for kodi and the amd GPU driver, but i do notice bit better perfomance with these higher kernels.
>
> Is the Lenovo Thinkpad T520 with Windows 7, connecting over Wifi?
> Because on wifi, even if i set my laptop 3 meters from the AP, i dont get max.
> About 1/2 the speeds, if lucky 3/4 the above speeds.
> Test you wifi with inSSIDer, optimze the chanels.
> Gave me about +25% speed at home on the wifi.
>
>> one of the  virtual machine is the samba VM connected via VPN
>> Looking to the cpu usage of this VM ist nearly zero during downloads.
> Did you tweak your MTU sizes?
No
> With things like :
> iptables -A PREROUTING --match policy --pol ipsec --dir in -i eth+ -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1361:1536 -j TCPMSS --set-mss 1360
> Maybe disable Path MTU discovery to prevent packet fragmentation problems. Helps alo  (  net/ipv4/ip_no_pmtu_disc=1  )
>
> Last, login on the proxymod monitor IRQ use, if you have extra cards in the server
it is a virtual machine on a proxmox root server
I just realized that the data transfer rate is going down after a while 
also on a linux workstation to the same slow speed as on windows 
workstation.
the root server is nearly idle
top - 16:46:31 up 313 days,  4:45,  1 user,  load average: 0.25, 0.42, 0.39
Tasks:  39 total,   1 running,  38 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.7 us,  2.9 sy,  0.0 ni, 96.2 id,  0.0 wa,  0.0 hi,  0.1 si,  
0.0 st
KiB Mem:   2097152 total,   767176 used,  1329976 free,        0 buffers
KiB Swap:  2097152 total,    61172 used,  2035980 free,   725864 cached

here the smb.conf

[global]

socket options = TCP_NODELAY SO_RCVBUF=524288 SO_SNDBUF=524288 
SO_KEEPALIVE IPTOS_LOWDELAY

nt acl support = no

   vfs object = recycle
   recycle:repository = Papierkorb
   recycle:keeptree = Yes
   recycle:touch = Yes
   recycle:versions = Yes
   recycle:maxsize = 0
   vfs objects = acl_xattr
   map acl inherit = Yes
   unix charset = ISO-8859-1
   display charset = ISO-8859-1
   security = share
   share modes = yes
   server string = %h server
   dns proxy = no
   interfaces=10.8.2.0/255.255.255.0
   bind interfaces only = yes
   disable netbios = yes
   smb ports = 445
   client NTLMv2 auth = yes
   log file = /var/log/samba/log.%m
   max log size = 1000
   syslog = 0
    panic action = /usr/share/samba/panic-action %d


    encrypt passwords = true
    passdb backend = tdbsam
    obey pam restrictions = yes
    unix password sync = yes
    passwd program = /usr/bin/passwd %u
    passwd chat = *Enter\snew\s*\spassword:* %n\n 
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
    pam password change = yes
    map to guest = bad user
    load printers = no
    printing = bsd
    printcap name = /dev/null
    disable spoolss = yes
    usershare allow guests = no

min receivefile size = 2048
use sendfile = true
aio read size = 2048
aio write size = 2048
write cache size = 1024000
read raw = yes
write raw = yes
getwd cache = yes
oplocks = yes
max xmit = 32768
dead time = 15
large readwrite = yes


[homes]
    comment = Home Directories
    browseable = yes
    read only = no
    valid users = %S

[test]
   vfs object = recycle
   recycle:repository = Papierkorb
   recycle:keeptree = Yes
   recycle:touch = Yes
   recycle:versions = Yes
   recycle:maxsize = 0
   path = /var/datas/test/
   public = yes
   writable = yes
   read only = no
   comment = smb share
   printable = no
   guest ok = yes
   create mode = 0775
   force user = root
   force group = root