FreeBSD 5-STABLE, APIC and SCB timeouts (was Re: FreeBSD 5-STABLE, MSI KT880 , fxp and SCB timeouts)

[John Baldwin]

On Friday 25 February 2005 07:04 pm, Mario Sergio Fujikawa Ferreira wrote:
> On Thu, Feb 24, 2005 at 09:52:52AM -0600, Jon Noack wrote:
> > Mario Sergio Fujikawa Ferreira wrote:
> > >On Wed, Feb 23, 2005 at 09:33:41PM -0600, Jon Noack wrote:
> > >>On 02/23/05 21:30, Dan Nelson wrote:
> > >>>In the last episode (Feb 23), Jon Noack said:
> > >>>>On 02/23/05 20:06, Mario Sergio Fujikawa Ferreira wrote:
> > >>>>>My last motherboard burned down to ashes so I got myself a brand
> > >>>>>(after 2 weeks) new MSI KT880. I am getting some weird results.
> > >>>>>
> > >>>>>1) fxp intel etherxpress 10/100 network cards report SCB timeout
> > >>>>>as well as achieving ridiculously low transfer rates of 600
> > >>>>>Bytes/second. Well, I got 10 KBytes/sec once but that does not count
> > >>>>>since a side box gets more than 50KB/s ;-) on the same hub. Oh, I've
> > >>>>>already switched hub ports, rj45 cables and fxp cards.
>
> 	After some research, it seems John Baldwin has found the
> reason for the SCB timeouts. It is related to APIC being enabled on the
> motherboard. It is optional for single processor systems but required for
> multiprocessor systems.
>
> 	The message regarding the patch is contained in the following URL
>
>  http://lists.freebsd.org/pipermail/freebsd-smp/2005-January/000751.html
>
> 	I have been using the aforementioned patch for the past 24
> hours. It is not perfect but I am getting some real speed (over
> 10KB/s though I should be getting close to 50KB/s). However, I am
> losing lots of packets when performing ping tests.
>
> 	Does anyone know anything further about it? I am willing
> to test trial patches as long as I do not lose my HDD data ;-D

This patch is in current@ already and on my MFC list.  Do you have a system 
with Pentium Pro CPUs?  If so, can you show me your dmesg output?

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org