sio driver sucks

Spartak Radchenko spartak at
Tue Nov 14 02:28:00 PST 2006

Mike Tancsa wrote:
> At 06:36 AM 11/13/2006, 
> =?KOI8-R?Q?=F3=D0=C1=D2=D4=C1=CB_=F2=C1=C4=DE=C5=CE=CB=CF?= wrote:
>> O. Hartmann ÐÉÛÅÔ:
>>> Sergey Matveychuk wrote:
>>>> Do you know an old sio driver is hardly usable?
>>>> There are many silo overflows, working with a terminal device is a
>>>> nightmare. There was a report about one crash with a message about a
>>>> spinlock holed more than 5 seconds (there is no core dump because 
>>>> it has
>>>> not repeated).
>>>> After a discussion in a Russian FIDO group I've change it on uart and
>>>> the problems gone.
>>>> I think a default driver should be changed from sio to uart until it
>>>> will be fixed.
>>> Had those overflows many times when I used FreeBSD 6.0-STABLE,
>>> 6.1-STABLE and a modem.
>>> But this never had a so bad influence forcing me into using uart.
>> I had serious problems with sio on Intel STL2 motherboard and recent 
>> stable. Massive silo overflows (modem was almost unusable) and at 
>> least 1 sio-related panic (spinlock held for more than 5 sec). Now I 
>> changed sio to uart ant it works like a charm. All problems gone.
> How do you switch it from sio to uart on RELENG_6 ?

Build a new kernel with device uart, change sio to uart tn the  
/boot/device.hints file. Maybe rebuilding a kernel is not needed, I 
never checked it.

Spartak Radchenko SVR1-RIPE

More information about the freebsd-stable mailing list