From: Franck <vagabon.xyz@gmail.com>
To: linux-mips@linux-mips.org
Subject: kernel is overwhelmed by usb hcd's interrupts
Date: Mon, 24 Oct 2005 12:08:34 +0200 [thread overview]
Message-ID: <cda58cb80510240308j168a9e30t@mail.gmail.com> (raw)
In-Reply-To: <cda58cb80510210702g3b0c0bdbk@mail.gmail.com>
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
parent reply other threads:[~2005-10-24 10:09 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <cda58cb80510210702g3b0c0bdbk@mail.gmail.com>]
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