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Forum Discussion
Readynas OS6 TX - Uplink speed Problem // Slow Performance on iperf
Hello,
first, I have to retype everything because this forum deleted my first text. :(
I have a serious performance Problem on my Readynas Ultra 2 with 2 GB and OS6. It seems Upload relat...
What ethernet stats are you seeing on the NAS? (the usual counts for loss, drops, etc)?
Do you only have one NIC connected? If not, then what bonding mode are you using?
Is ethernet flow control enabled on the PC?
Hi, thx for your reply.
After a few ours of fiddling around, I just found the answer. It wasnt the Readynas, so this is the wrong forum. Sorry for that.
But you were on the right way. The 8 Port unifi Switch had a problem, flow control was turned off. So I turned it on just to see what happens. Results were the same, so I turned it off again and suddenly I got the desired performance of 945 Mbit.
I now can connect my Imac to my Nas with 84/102 Mbyte/s over afp. But on SMB I only get 30/30....
I will check this later...
Thank you I think we can close this. Flow Control needs to be turned off, even when the admin panel showed that it was off.
br kixm
kixm wrote:
Flow Control needs to be turned off
Not necessarily, but adjusting flow control should be part of the troubleshooting.
The original ethernet flow control is actually a "pause". So if too much traffic is going to a device, flow control will block all new traffic going to the device until the queue drains. No packets would be lost.
If ethernet flow control is disabled, then the queue will overflow and packets will be lost. TCP's congestion control will back off the rate significantly in response to the packet loss, and it will slowly increase the rate that. There are several TCP congestion control algorithms in the wild - it's been enhanced/tuned over the years. So different senders will behave differently when there is packet loss.
In my own experience, enabling ethernet flow control end-to-end (switches and clients) often helps performance, especially if you have some older devices on slower links. But this isn't a "one size fits all" thing - so you basically need to try it both ways (similar to Jumbo Frames).
kixm wrote:
I now can connect my Imac to my Nas with 84/102 Mbyte/s over afp. But on SMB I only get 30/30....
There are two settings you could try.
- Turn off Strict Sync (advanced SMB settings). That significantly speeds up some applications
- Disable SMB transport encryption. Your NAS has no hardware support for encryption, and that could be the bottleneck.
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