On 27/04/19 2:46 am, Andreas B. Mundt wrote: > Hi all, > > On Fri, Apr 26, 2019 at 09:54:37AM +0200, Jonas Smedegaard wrote: >> >> So a summary of the tests is this: >> >> Board, cable mode, patchset \ Measured speed in Mbit/sec >> rev.G2 1Gbit mode pristine: 14 & 722 >> rev.G2 1Gbit mode TX_DELAY=4: 428 & 774 >> rev.C 1Gbit pristine: 1 & 526 >> rev.C 100Mbit pristine: 94 & 94 >> rev.C 1Gbit TX_DELAY=4: 61 & 141 >> rev.C 100Mbit TX_DELAY=4: 89 & 89 >> > > I tried to reproduce the results for my rev.G2 board (2017), but could > not reproduce the bad performance. My results are:
Oops! Forget to mention an important detail. Only about 20% of the Rev.G2 boards that Olimex tested (out of a large number) were facing this issue. We were also not able to reproduce the problem on one of the Rev.G2 boards. However, Olimex assures us that the problem is real. They mentioned that tolerances ranges of various hardware components could be the reason for only some boards facing this issue and not all. Setting TX_DELAY=4 works on 100% of all Rev. G2 boards. When releasing FreedomBox Pioneer Edition this week, we had to unfortunately ship with a patched version of u-boot with TX_DELAY=4. -- Sunil
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