vr(4) troubles for AMD Geode CS5536 chipset

[Eugene Grosbein]

04.09.2012 04:43, YongHyeon PYUN пишет:

>> None. I've read its source and learned it prints its debug
>> to the kernel dmesg buffer with sysctl dev.vr.1.stats=1
>> and done that before, during and after noted failure -
>> all counters are zero except of good frames conters (in/out).
> 
> Ok, it seems you didn't encounter TX/RX MAC shutdown/restart
> related issues.  To get more verbose debugging messages, you have
> to define VR_SHOW_ERRORS in if_vr.c.

I'll try this evening.

> BTW, I see really poor bulk TCP performance on vr(4) with CURRENT
> (< 12 Mbps). :-(
> This is a quad-port VT6105 with Core2 Duo E6550.  Pre-r235334
> restores the old good performance for me(> 86Mbps). However I can't
> explain how taskq change shows this huge difference.

Have you tried to remove options PREEMPTING from the kernel for newest driver?
That helped me a lot - performance of new driver returned to the level of old one.

Eugene Grosbein