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Forum Discussion
Struggling With Low Speeds < 15MBps Over Gigabit
Hey Guys I have been having a major PITA regarding transfer speeds ever since I purchased my 'ReadyNas Ultra 4 Plus' in May 2011. Originally, I was only getting approx 5-6 MB/second and came to...
When I did a transfer from the PC to my Pro, I got an average packet size in the NAS RX packets of ~1450 bytes. Since I am using the normal ethernet MTU, that is what I expected. There were packets in the TX direction as well (acknowledgements) that were small. I didn't track the number of them.
Since you are not able to run standard 1500 byte ethernet packets, I'd expect to see every data packet fragmented into 2. So the average size would be ~750 bytes, though in reality each packet is getting split into a large one and a small one. Those fragments have to be reassembled on the receiver, which is one reason for your lower performance. My guess is that the NAS is detecting the packet size ceiling - that would explain why reads are so much faster than the writes. However, that is just a guess right now.
In your test you transferred the file in both directions, and reported the summed result. If you get a chance, it would help if you test again, and report the read and write tests stats separately.
Testing with the broadcom part is also an important next step.
There is no real point in rebuilding the NAS - as far as I can see there is nothing wrong with it. You'd be better off completing the network tests, so we can figure out how to fix that first. You absolutely should be able to send 1500 byte packets on your local ethernet.
After we get that sorted, we should be able to tell where we are with the NAS.
Since you are not able to run standard 1500 byte ethernet packets, I'd expect to see every data packet fragmented into 2. So the average size would be ~750 bytes, though in reality each packet is getting split into a large one and a small one. Those fragments have to be reassembled on the receiver, which is one reason for your lower performance. My guess is that the NAS is detecting the packet size ceiling - that would explain why reads are so much faster than the writes. However, that is just a guess right now.
In your test you transferred the file in both directions, and reported the summed result. If you get a chance, it would help if you test again, and report the read and write tests stats separately.
Testing with the broadcom part is also an important next step.
There is no real point in rebuilding the NAS - as far as I can see there is nothing wrong with it. You'd be better off completing the network tests, so we can figure out how to fix that first. You absolutely should be able to send 1500 byte packets on your local ethernet.
After we get that sorted, we should be able to tell where we are with the NAS.
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