On Fri, Nov 14, 2003 at 01:40:14PM -0800, David Brownell wrote:
> Eric Blossom wrote:
>
> That should certainly not be happening! Can you reproduce this
> with a pure kernel driver that doesn't use usbfs/devio? And
> with the current 2.4.23 code? (Or better yet, 2.6.0-test9...)
Thanks for the response. I'll attempt to reproduce and provide
additional characterization.
> The only other possibility that comes to mind is that VT6202 hardware
> (but not the newer VT6212, or southbridge EHCI like VT8235/VT8237)
> has been problematic, including some of what have always seemed to me
> like errata. If you're using VT6202, see if different EHCI hw helps.
> (Most NEC controllers won't sustain 31+ MB/sec throughput, fwiw,
> but 20+ MB/sec is usually achievable.)
The machine I'm seeing this on is an IBM X31 laptop.
00:1d.7 USB Controller: Intel Corp. 82801DB USB EHCI Controller (rev 01) (prog-if 20
[EHCI])
Subsystem: IBM: Unknown device 052e
Flags: bus master, medium devsel, latency 0, IRQ 11
Memory at c0000000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] #0a [2080]
I can test on another machine with an NEC board in it.
Eric
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