Dell R710 w/ Intel 82576 gigabit NIC (latest Intel drivers). I'm setting up a new Windows Server 2008 R2 SP1 & so far I've installed updates & configured the File Services & Web Server (IIS) roles. Windows Advanced Firewall is on (by default), and configuring the roles seemed to activate some rules to allow the web server ports & file sharing.
Problem: I can connect to a test file share fine, but copying large files is abysmally slow. I'm getting ~10MB/s copying to/from a Windows 7 client. The same client can easily get 80-90MB/s to a different file server (so it's not the client). If I disable the firewall, I get full gigabit speeds. If I enable it, it drops down to 10MB/s. I'm using the default firewall settings that are configured when enabling the File Sharing role. Obviously I need to enable others, but which ones?
After further investigation, it seems to be one (or all) of the "Network Discovery" inbound/outbound rules. I noticed Windows enabled these rules on the "Private" profile, but not the "Domain" profile. If I enable them all for the "Domain" profile, the problem goes away. I don't like blindly enabling rules.
I take the above comment back. Enabling "Network Discovery" rules seemed to work briefly, but now it stopped.
Well, this is turning out to be a network problem. Just happened to rear it's ugly head around the same time I brought this server online. I don't think the extra firewall rules I mentioned here are required at all.
So I assume you're in an AD Domain, so make sure your client and server show they are using their domain firewall profile.
Windows determines it's on a domain by the DNS suffix of it's connection (ipconfig/all "primary dns suffix").
On a new 2008 R2 server I use as a file server, I have file sharing, web server, and DFS enabled, and here's my default inbound rules for comparison. I've never known the firewall to affect SMB speed, but still work a check.
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Other things I've seen are a bad network cable (on your server) that drops your connection to 100MB, so I would test speed between server and Ubuntu to validate (and check status page of NIC in windows to see connect speed). Also, why not use the mobo Broadcom NIC's? They'll give you 1GB throughput all the same.