linux-kernel - Re: OHCI USB hangs during intensive use, nVidia MCP78S chipset, few questions to help me find the problem.

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Date:	Sat, 27 Jun 2009 11:27:58 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Zbigniew Luszpinski <zbiggy@...pl>
CC:	linux-kernel@...r.kernel.org
Subject: Re: OHCI USB hangs during intensive use, nVidia MCP78S chipset, few
 questions to help me find the problem.

On 06/27/2009 09:51 AM, Zbigniew Luszpinski wrote:
> Hello,
>
> after upgrading my CPU from single core to multicore and mainboard I started
> to have problem with OHCI USB controller. It hangs during big data transfer
> (USB hdd drive, pendrive, IRDA dongle or adsl modem). The result of hang is
> usb device is not responding. This is the only error I found. I would like to
> learn why it hangs and fix it. I tried kernels 2.6.27-30 and most popular
> Linux distributions. Adding noapic or acpi=noirq parameter to kernel boot line
> almost workarounds the problem, disabling tickless kernel: CONFIG_NO_HZ also
> makes usb ohci hanging a little bit less. Usb 1.1 devices still hangs but
> seldom: only transferring over 100MiB file to/from usb hdd or downloading
> CentOS dvd iso from ftp or torrent can hang usb. I do not want to be left with
> workaround. I want to fix it. Can you tell me how to find the issue and where
> to look for faulty code? By looking at kernel parameters which cures the usb
> ohci bug it must be something wrong with IRQs.

Are you getting any kernel errors/messages in dmesg? In any case you 
should post your dmesg output from bootup.
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