| To: | linux-mips@linux-mips.org |
|---|---|
| Subject: | kernel is overwhelmed by usb hcd's interrupts |
| From: | Franck <vagabon.xyz@gmail.com> |
| Date: | Mon, 24 Oct 2005 12:08:34 +0200 |
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| In-reply-to: | <cda58cb80510210702g3b0c0bdbk@mail.gmail.com> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <cda58cb80510210702g3b0c0bdbk@mail.gmail.com> |
| Sender: | linux-mips-bounce@linux-mips.org |
Hi,
I've written an usb driver for linux for a specific usb host
controler. Basicaly the hw generates an interrupt every 1 ms (every
start of frame) and during transfers interrupts can be generated every
30 us ! My cpu is a MIPS 4KEC running at 96Mhz and HZ is 100.
After transfering 20M bytes of data through USB, the kernel loops for
a while in timer interrupt handler. It actually loops in update_times
with tick (jiffies - wall_jiffies) value equals to 3707637046 ! I
guess that the kernel have lost a lot of timer ticks...However
interrupts are enable inside usb driver, I don't see how the kernel
can lost so many ticks.
Could anyone give me some advices for that ?
Thanks
--
Franck
--
Franck
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