Helmut Toplitzer wrote:
Second copy of this message for the individually adressed -- sorry, only
now noticed usb-devel wasn't in CC on that one...
On Wednesday 21 December 2005 16:52, Alan Stern wrote:
Seems to me Rene's thread belongs here on linux-usb-devel. I don't know
if it's truly related to Helmut's disconnect problem...
so can we nail communication down to one channel? otherwise it will be realy
hard for others (and probably me :-) to follow on this topic.
linux-usb-devel is fine by me. Not subscribed, so please keep me in CC
though...
Alan -- one thing Helmut didn't mention was that he also experiences the
drop in IDE throughput; from 34MB/s to 15MB/s in his case and in the
same way. That is, doesn't happen immediately on modprobe ehci-hcd, but
happens when ehci has actually been used, and (only) unloading ehci-hcd
fixes things again.
So, I really do believe it's the same problem. His disconnects are
probably due to timeouts, with the chip being way too busy turning the
async schedule on constantly or something like that? Seeing how he loses
20MB/s throughput on IDE (I loose 8MB/s) that's quite a bit of activity
that's going on there...
i'm not familiar with the usb-code. (took a quick look and found about 90
references about ehci and async) Thus i hope you don't adressed me on adding
the printks. i'm not even knowing how the drivers interact.
But i'm willing to apply patches and try them out if available ...
Same here. In fact, certainly willing, since I consider this a rather
serious bug, in either driver or chip. I have this nagging feeling that
quite a few people are using much slower computers than they could be,
if they'd unloaded ehci-hcd after use...
BTW: unloading ehci-hcd indeed solves my problem of disconnecting device.
(Looks like uhci driver is fast enough to transfer video)
Okay. We both have VIA, mine's a VT6212L on a PCI board alongside an
unused NEC firewire controller, and is a rev 63:
00:09.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 61)
00:09.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 61)
00:09.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 63)
00:09.3 FireWire (IEEE 1394): NEC Corporation IEEE 1394 Host Controller
(rev 01)
His was something like rev 84. Also on a PCI board? And, yes, for me
speaking to my external HDD through UHCI on that same port also solves
the problem -- it's obviously not a solution for an HDD though.
Rene.
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