Messages in this thread | | | Date | Fri, 9 May 2003 14:28:28 -0700 | From | Andrew Morton <> | Subject | Re: 2.5.69 Interrupt Latency |
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Paul Fulghum <paulkf@microgate.com> wrote: > > In the process of eliminating kernel options to isolate > the problem, eliminating USB completely appears to fix it. > > One machine (server) was using usb-uhci and > the other (laptop) was using usb-ohci. > > So it looks like something with USB in 2.5.68-bk11
ah, that helps.
This code was added to wakeup_hc(). It is called from uhci_irq():
+ /* Global resume for 20ms */ + outw(USBCMD_FGR | USBCMD_EGSM, io_addr + USBCMD); + wait_ms(20);
The changelog just says "Minor patch for uhci-hcd.c"
Can you delete the wait_ms() and see if that is our culprit? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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