Hi!
What kind of an EHCI controller do you have?
We've come across some that won't support 32MB/s on transmit.
http://www.asus.com/products.aspx?modelmenu=1&model=2593&l1=3&l2=179&l3=815&l4=0
Intel X58 chipset on an Asus P6 Deluxe. We are using the onboard controller.
test_usrp_standard_tx reports
xfered 1.34e+08 bytes in 4.19 seconds. 3.2e+07 bytes/sec. cpu time = 0
0 underruns
Identical behavior on another machine, which has Athlon 64 X2 and hence
different mainboard and chipset, definitely no Intel chipset. But I am
not at the institute and can't tell you the controller name at the
moment (but tomorrow, if you need it).
Dominik
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