On Wed, 2005-03-02 at 18:28, David Brownell wrote: > On Wednesday 16 February 2005 3:37 am, Steve Hosgood wrote: > > Basically, David, your suggestion of "try small URBs" works! I am now > > seeing 40 fps from my camera with URBs of 4K, 8K and 16K.
> OK, then this looks weird. Can you see if this patch helps > at all? It shouldn't matter, but this test is more direct > and so it should catch cases where the hardware isn't quite > acting as expected. (Some chips have misbehaved in related > areas...) > Works for me! Bulk transfers using 8 urbs each of 32K size with a small USB bulk packet indicating frame-sync from my camera. Kernel used: 2.6.10 (from Fedora Core 2's latest sources-package). I've no reason to believe that the same fix won't work on vanilla 2.6.11 USB 2.0 hardware on my machine is provided by a PCI card (the motherboard only does USB 1.x): "/sbin/lspci" reports: 02:0a.2 USB Controller: NEC Corporation USB 2.0 (rev 04) "/sbin/lsusb -v" reports: ehci_hcd: block sizes: qh 128 qtd 96 itd 192 sitd 96 PCI: Enabling device 0000:02:0a.2 (0114 -> 0116) ACPI: PCI interrupt 0000:02:0a.2[C] -> GSI 10 (level, low) -> IRQ 10 ehci_hcd 0000:02:0a.2: EHCI Host Controller ehci_hcd 0000:02:0a.2: reset hcs_params 0x2293 dbg=0 cc=2 pcc=2 ports=3 ehci_hcd 0000:02:0a.2: reset portroute 1 0 1 ehci_hcd 0000:02:0a.2: reset hcc_params e806 thresh 0 uframes 256/512/1024 park ehci_hcd 0000:02:0a.2: capability 0001 at e8 ehci_hcd 0000:02:0a.2: irq 10, pci mem 0xe9104000 ehci_hcd 0000:02:0a.2: new USB bus registered, assigned bus number 1 ehci_hcd 0000:02:0a.2: reset command 080b02 park=3 ithresh=8 period=1024 Reset HALT ehci_hcd 0000:02:0a.2: init command 010b09 park=3 ithresh=1 period=256 RUN ehci_hcd 0000:02:0a.2: USB 2.0 initialized, EHCI 1.00, driver 26 Oct 2004 ehci_hcd 0000:02:0a.2: supports USB remote wakeup Hope that's useful. I'm still here and ready to run more tests if you need. Steve Hosgood. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
