Slow throughput
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i'm having the same problem but still having problems tracing it out using the troubleshooting method (using iperf)
Here's the list of setups i've tried
Ubuntu -> Pfsense - 814Mb/s
Pfsense -> Ubuntu - 1Gb/s
Win2k8R2 -> Ubuntu - 727Mb/s
Win2k8R2 -> Pfsense - 460Mb/s
Win2k8R2 -> Win2k8R2 - 910Mb/s
Win2k8R2 -> FreeNAS - 502Mb/s
FreeNAS -> Pfsense - 293Mb/s
Pfsense -> FreeNAS - 400Mb/sAll of the devices above are equipped with gigabit ethernet interfaces with CAT6 cables.
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i have narrowed down the problem.. and it seems that the tcp window size on each of these machines are different.. i've tried to manually put in a fixed tcp window size on the windows machines but it doesn't commit to the changes no matter how :-\
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i have narrowed down the problem.. and it seems that the tcp window size on each of these machines are different.. i've tried to manually put in a fixed tcp window size on the windows machines but it doesn't commit to the changes no matter how :-\
Have you tried the "DrTCP" utility from http://www.dslreports.com ?
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somehow the tweaks from DrTCP doesn't apply to Windows7/Windows Server 2008 R2.. :(
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Try running the following command in an elevated Command Prompt for Win7/ 2k8:
netsh int tcp set global rss=enabled autotuninglevel=experimental congestionprovider=ctcp netdma=enabled