• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Slow send to server... receive = fine

Page 2 - Seeking answers? Join the AnandTech community: where nearly half-a-million members share solutions and discuss the latest tech.
So the desktop gets

Code: 
E:\iperf>iperf3 -c acer
Connecting to host acer, port 5201
[  4] local 192.168.1.213 port 50690 connected to 192.168.1.11 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   768 KBytes  6.29 Mbits/sec
[  4]   1.00-2.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   2.00-3.00   sec   512 KBytes  4.20 Mbits/sec
[  4]   3.00-4.00   sec   640 KBytes  5.24 Mbits/sec
[  4]   4.00-5.00   sec   512 KBytes  4.20 Mbits/sec
[  4]   5.00-6.00   sec   512 KBytes  4.20 Mbits/sec
[  4]   6.00-7.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   7.00-8.00   sec   640 KBytes  5.24 Mbits/sec
[  4]   8.00-9.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   9.00-10.00  sec   640 KBytes  5.24 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  5.62 MBytes  4.72 Mbits/sec                  sender
[  4]   0.00-10.00  sec  5.44 MBytes  4.57 Mbits/sec                  receiver

The laptop gets:

Code: 
E:\iperf>iperf3 -c acer
Connecting to host acer, port 5201
[  4] local 192.168.1.185 port 62076 connected to 192.168.1.11 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  5.00 MBytes  41.8 Mbits/sec
[  4]   1.00-2.00   sec  4.88 MBytes  41.0 Mbits/sec
[  4]   2.00-3.00   sec  5.12 MBytes  42.9 Mbits/sec
[  4]   3.00-4.00   sec  5.62 MBytes  47.2 Mbits/sec
[  4]   4.00-5.00   sec  5.88 MBytes  49.3 Mbits/sec
[  4]   5.00-6.00   sec  5.62 MBytes  47.1 Mbits/sec
[  4]   6.00-7.00   sec  5.50 MBytes  46.1 Mbits/sec
[  4]   7.00-8.00   sec  5.88 MBytes  49.3 Mbits/sec
[  4]   8.00-9.00   sec  5.75 MBytes  48.2 Mbits/sec
[  4]   9.00-10.00  sec  5.62 MBytes  47.2 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  54.9 MBytes  46.0 Mbits/sec                  sender
[  4]   0.00-10.00  sec  54.9 MBytes  46.0 Mbits/sec                  receiver
 
andyinv said:
So the desktop gets

Code: 
E:\iperf>iperf3 -c acer
Connecting to host acer, port 5201
[  4] local 192.168.1.213 port 50690 connected to 192.168.1.11 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   768 KBytes  6.29 Mbits/sec
[  4]   1.00-2.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   2.00-3.00   sec   512 KBytes  4.20 Mbits/sec
[  4]   3.00-4.00   sec   640 KBytes  5.24 Mbits/sec
[  4]   4.00-5.00   sec   512 KBytes  4.20 Mbits/sec
[  4]   5.00-6.00   sec   512 KBytes  4.20 Mbits/sec
[  4]   6.00-7.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   7.00-8.00   sec   640 KBytes  5.24 Mbits/sec
[  4]   8.00-9.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   9.00-10.00  sec   640 KBytes  5.24 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  5.62 MBytes  4.72 Mbits/sec                  sender
[  4]   0.00-10.00  sec  5.44 MBytes  4.57 Mbits/sec                  receiver

The laptop gets:

Code: 
E:\iperf>iperf3 -c acer
Connecting to host acer, port 5201
[  4] local 192.168.1.185 port 62076 connected to 192.168.1.11 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  5.00 MBytes  41.8 Mbits/sec
[  4]   1.00-2.00   sec  4.88 MBytes  41.0 Mbits/sec
[  4]   2.00-3.00   sec  5.12 MBytes  42.9 Mbits/sec
[  4]   3.00-4.00   sec  5.62 MBytes  47.2 Mbits/sec
[  4]   4.00-5.00   sec  5.88 MBytes  49.3 Mbits/sec
[  4]   5.00-6.00   sec  5.62 MBytes  47.1 Mbits/sec
[  4]   6.00-7.00   sec  5.50 MBytes  46.1 Mbits/sec
[  4]   7.00-8.00   sec  5.88 MBytes  49.3 Mbits/sec
[  4]   8.00-9.00   sec  5.75 MBytes  48.2 Mbits/sec
[  4]   9.00-10.00  sec  5.62 MBytes  47.2 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  54.9 MBytes  46.0 Mbits/sec                  sender
[  4]   0.00-10.00  sec  54.9 MBytes  46.0 Mbits/sec                  receiver
Click to expand...


Did you try the usb stick on the laptop.
 
Yeah, already seen that one thanks. Sadly, no effect 🙁

Tempted to use one of our MS support calls at work, hehe....
 
sdifox said:
Did you try the usb stick on the laptop.
Click to expand...

Just did that - the problem followed. When I removed it and went back to the laptop wifi, normal performance resumed. So now it looks very much like driver...

EXCEPT.... I've already clean-installed this machine with windows 10 twice, and it can only have pulled the same driver. Which makes zero sense... I'd have noticed the poor upload when sending digital photos to the server...
 
This is branded Edumax (nope, me neither), but it's a Realtek chipset. I tried the Realtek drivers, but they're older than what I have. No difference. Device manager shows Realtek drivers in place. Again tho, this worked before..
 
Out of curiosity, have you consider the USB drivers? Do you get the same transfer speeds to a USB stick on both computers?
 
@OP

I'm not familiar with Wirshark, but I do downloaded your files and open 2 of them.

fastlaptop.pcapng and slowtoserver.pcapng

I find that fastlaptop has much smaller TCP Window Size ranging from 250 to around 2000 yet slowtoserver has TCP Window Size = 64240, maybe this causes the slow down?

I hope experts in anand forum can help explaining.
 
XavierMace said:
Out of curiosity, have you consider the USB drivers? Do you get the same transfer speeds to a USB stick on both computers?
Click to expand...

Now, there's an idea... I have a USB3 stick for transferring files about, I'll give that a try tonight. Cheers!

USB works, I have transferred files about on it - but whether it works right/optimal is another matter. I didn't notice the speed last time.
 
mxnerd said:
@OP

I'm not familiar with Wirshark, but I do downloaded your files and open 2 of them.

fastlaptop.pcapng and slowtoserver.pcapng

I find that fastlaptop has much smaller TCP Window Size ranging from 250 to around 2000 yet slowtoserver has TCP Window Size = 64240, maybe this causes the slow down?

I hope experts in anand forum can help explaining.
Click to expand...

Yeah, I'm noticing that - if you open them in Message Analyzer and enable the SMB2 view, you can see pretty spectacularly the time difference for the sections. It looks like SMB pipelining is happening, but the window size seems to be the big factor. Bytes-in-flight is quite a difference too..
 
So, finally grabbed a long enough gigabit cable from work and a quick iperf3 test:

Code: 
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  1.09 GBytes   939 Mbits/sec                  sender
[  4]   0.00-10.00  sec  1.09 GBytes   939 Mbits/sec                  receiver

Copied a test file over:
Code: 
   Speed :            21131792 Bytes/sec.
   Speed :            1209.170 MegaBytes/min.

and copied it back:
Code: 
   Speed :           102400000 Bytes/sec.
   Speed :            5859.375 MegaBytes/min.

Did various other tests copying the file over, and it's still considerably slower than receiving. But.... I can live with that. I'll end up routing this cable permanently I reckon.

So, onto the USB3 flash drive test.

First, laptop:
Code: 
   Sequential Read (Q= 32,T= 1) :   205.606 MB/s
  Sequential Write (Q= 32,T= 1) :    57.143 MB/s
  Random Read 4KiB (Q= 32,T= 1) :     6.844 MB/s [  1670.9 IOPS]
 Random Write 4KiB (Q= 32,T= 1) :     0.729 MB/s [   178.0 IOPS]
         Sequential Read (T= 1) :   193.375 MB/s
        Sequential Write (T= 1) :    63.545 MB/s
   Random Read 4KiB (Q= 1,T= 1) :     5.517 MB/s [  1346.9 IOPS]
  Random Write 4KiB (Q= 1,T= 1) :     0.632 MB/s [   154.3 IOPS]

  Test : 1024 MiB [F: 54.9% (16.1/29.3 GiB)] (x5)  [Interval=5 sec]
  Date : 2015/09/18 18:57:22
    OS : Windows 10 Professional [10.0 Build 10240] (x64)

And now the troublesome Skylake desktop.

Code: 
   Sequential Read (Q= 32,T= 1) :   172.811 MB/s
  Sequential Write (Q= 32,T= 1) :    30.590 MB/s
  Random Read 4KiB (Q= 32,T= 1) :     8.199 MB/s [  2001.7 IOPS]
 Random Write 4KiB (Q= 32,T= 1) :     0.879 MB/s [   214.6 IOPS]
         Sequential Read (T= 1) :   193.984 MB/s
        Sequential Write (T= 1) :    29.568 MB/s
   Random Read 4KiB (Q= 1,T= 1) :     7.100 MB/s [  1733.4 IOPS]
  Random Write 4KiB (Q= 1,T= 1) :     0.755 MB/s [   184.3 IOPS]

  Test : 100 MiB [D: 54.9% (16.1/29.3 GiB)] (x5)  [Interval=5 sec]
  Date : 2015/09/18 18:37:51
    OS : Windows 10 Professional [10.0 Build 10240] (x64)

It looks like despite the far higher spec PC, and the latest hardware, that in terms of writes my shiny new desktop is in the region of half as fast (reads, not so much different).

This would look very much like the chipset drivers for USB3 on Skylake motherboard aren't quite up to scratch yet and perhaps this is the reason my wi-fi sends (which might equate to disk writes in terms of data flowing out the USB) are so much slower.

I think we can close this one off as "it's all USBs fault"... whaddya think?
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top