Writes to Linux Samba Shares are exceedingly slow

I have a Linux server with file shares on my local network. My problem is with writing data to those shares from my Windows 10 Home PC. The problem manifests with data writes that are exceedingly slow (not greater than 300 kB/sec) and generally time out before they complete. The problem is aggravated with larger file sizes. I also notice that the Linux server does not show up when browsing the network on the Windows 10 PC, but it does show up when browsing the network from the Windows 7 PCs.

I have done extensive troubleshooting of the problem and found that this problem is specific to the one Windows 10 PC that I have. All other PCs (running Windows 7) work just fine. I have tested the Windows 7 PCs on the same network port where my Windows 10 PC is located. I even went so far as to purchase a new NIC for the Windows 10 PC, but the behavior has not changed.

The one odd aspect to the problem is that I can make it go away by changing the Windows 10 PC's work group name to something other than usual value (WORKGROUP), changing the work group name back to WORKGROUP, and rebooting the PC. This action causes the shares to behave correctly (reads and writes are generally done at 10 MB/sec or better) until I reboot the PC again, at which time the aberrant behavior resurfaces.

Here are some further details concerning the configuration:

• Windows version is 10.0.10586
• The LMHOSTS file on the windows PC has an entry for the Linux server.
• The Linux server is running CentOS 7.2.1511
• The kernel version is 3.10.0-327.4.4
• The version of Samba is 4.2.3-11
• The smb.conf file on the Linux server is as follows:

Code:

[global]
    workgroup = WORKGROUP
    server string = Samba Server
    netbios name = SERVER1
    load printers = no
    disable spoolss = yes
    log file = /var/log/samba/log.%m
    max log size = 50
    preferred master = yes
    local master = yes
    domain master = yes
    os level = 65
    security = user
    dns proxy = no
    wins support = yes

    unix extensions = no
    map to guest = Bad User
    getwd cache = yes
    kernel oplocks = yes

    socket options = IPTOS_LOWDELAY TCP_NODELAY SO_KEEPALIVE

[homes]
    comment = Home Directories
    path = /WinHomes/%u
    read only = No
    create mask = 0770
    directory mask = 0770
    inherit permissions = Yes
    inherit owner = Yes
    browsable = yes

[Family]
    path = /WinHomes/Family
    valid users = User1, User2
    admin users = User1, User2
    write list = User1, User2
    force group = Family
    read only = No
    acl group control = Yes
    create mask = 0770
    directory mask = 0770
    browsable = yes

[ER_Share]
    path = /WinHomes/U_share
    valid users = User1, User2
    valid users = User1, User2
    admin users = User1, User2
    write list = User1, User2
    force group = Users
    read only = No
    acl group control = Yes
    create mask = 0770
    directory mask = 0770
    browsable = yes

Disabling "Large Send Offload (LSO)" as suggested at Slow network throughput on windows 10 seems to have worked for me; at least for now. I've thought this problem was licked before, only to find out after a reboot that it came right back. I'll keep my fingers crossed that this fix stays permanent.