Bizzarely Slow Network Shares

[MatthiasvW]

Hey all,

Just set up Win7 RTM on one of the machines in our office and I'm noticing something very strange: when we try to open a network drive, it's taking upwards of 40 seconds. You double-click on the drive and then just sit there as the green bar just CRAWLS across the address box and then finally displays the contents of the drive.

What's worse is that it does the same thing every time you change a directory on the network drive.

Opening network resources via URI does the same thing. It's just strange.

I've already disabled RDC on the machine, and it hasn't made a difference after a reboot.

Has anyone seen anything similar? Any thoughts?

 

[zigzag3143]

how about disabling IPv6 support in network and sharing. could you tell us more abt your network setup?

 

[MatthiasvW]

Yeah, already disabled IPv6.

Network setup, yeesh. Uh, 100mb internal network through a Cisco Catalyst 3650 (I think) which is uplinked to our datacenter via a 100mb metro fiber connection. Workstation has an Intel gigabit adapter.

 

[zigzag3143]

Yeah, already disabled IPv6.

Network setup, yeesh. Uh, 100mb internal network through a Cisco Catalyst 3650 (I think) which is uplinked to our datacenter via a 100mb metro fiber connection. Workstation has an Intel gigabit adapter.

OK con we assume its on a subnet with a domain controller, or is it a workgroup? when you set up win 7 did you set up a homegroup, (or a work like) workgroup?


K

 

[dood]

Do you have any other redirectors? (Like a novell client?)
Have you tried a direct UNC map using the IP rather than the NBT Hostname? (Any difference there?)

 

[MatthiasvW]

Nope, no Novell client or anything of that sort.
Using the direct UNC map with the IP is the same result. Same slow green crawl.

And we're on a subnet with a BDC, our PDC is up at the datacenter. Machine is joined to the AD domain.

 

[zigzag3143]

do you have indexing on for networked drives?

 

[MatthiasvW]

I don't see it turned on in the indexing options.

This is also odd, the estimates of file transfer times are dramatically incorrect. Just copying a 1GB file, said 10 minutes, took 2. Weird.

 

[dood]

I don't see it turned on in the indexing options.

This is also odd, the estimates of file transfer times are dramatically incorrect. Just copying a 1GB file, said 10 minutes, took 2. Weird.

Windows couldnt calc the xfer time of a 2k txt file correctly so I wouldnt worry too much about that... If this was XP, I'd be suggesting WIRESHARK to capture some info on the wire. (Look for failures, deltas between any 'conversations'...etc).. But I'm new to win7 and I can't even think of any sniffers for win7. (Any suggestions would be nice... ) I know this is a longshot...but... Have you eliminated the network as being a problem? If nothing can be tracked down regarding the OS, perhaps dropping the machine on a small switch with another box and trying a copy would give you more info.

 

[MatthiasvW]

I doubt it's the machine or the network. Last Friday when this was still a Vista box it was doing great with the network drives.

 

[MatthiasvW]

I'm officially confused. Two days of sucking wind like Prince Fielder in an uphill race, and now I come back from lunch and it's GREAT.

I need to start drinking more.

 

[dood]

Gremlins?!?!

 

[zigzag3143]

I'm officially confused. Two days of sucking wind like Prince Fielder in an uphill race, and now I come back from lunch and it's GREAT.

I need to start drinking more.

You have kids or pets?

 

[logicearth]

I've already disabled RDC on the machine, and it hasn't made a difference after a reboot.

Disabling Remote Differential Compression (RDC) had no effect because it doesn't do anything outside of the applications that use it. The only one in Windows Vista/7 that use RDC is Offline Files. Transferring files though Explorer does not make use of RDC. And having RDC enabled doesn't slow down network transfers, it can in fact speed things up.

 

[MatthiasvW]

You have kids or pets?

2 cats, first kid on the way. So yeah. As if my hair wasn't turning grey quickly enough.

 

[MatthiasvW]

Disabling Remote Differential Compression (RDC) had no effect because it doesn't do anything outside of the applications that use it. The only one in Windows Vista/7 that use RDC is Offline Files. Transferring files though Explorer does not make use of RDC. And having RDC enabled doesn't slow down network transfers, it can in fact speed things up.

That's fair, I was simply looking for something, anything.

And as a general update, right after the problem got better, it got worse.

And then got better again a half hour later.

And now we're back to the same nonsense this morning.

I think I'm losing it.

 

[MatthiasvW]

Aha.

Disabled autotuning.

Perfect now.