Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-29 Thread Alan Cox
> The problem could also be something other than SMM, like DMA > starvation by a video or disk controller. Try disabling all hard > drive controllers and booting from a CD or USB stick. You'll get starvation from the disk DMA but only if you are using the disk and doing DMA otherwise it won't hav

Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-29 Thread Lee Revell
On 3/29/07, Kevin Perros <[EMAIL PROTECTED]> wrote: > No it is an "indutrial" motherboard. > Although I don't know what makes it "industrial". > > Regards. > > Is this related to SMM? > > As far as I can tell, the BIOS is Phoenix AwardBIOS v6.00PG. > > Would someone know how to disable SMM in thi

Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-29 Thread Kevin Perros
> No it is an "indutrial" motherboard. > Although I don't know what makes it "industrial". > > Regards. > > Is this related to SMM? > > As far as I can tell, the BIOS is Phoenix AwardBIOS v6.00PG. > > Would someone know how to disable SMM in this BIOS? Usually you cannot disable SMM via the BIOS

Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-29 Thread John
Lee Revell wrote: John wrote: Would someone know how to disable SMM in this BIOS? There's no generic way. I understand. Would someone know how to disable SMM in the VIA Pro133T chipset (VT82C596B south bridge). What I/O ports do I need to write to, and what values should I write to these

Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-28 Thread Lee Revell
On 3/28/07, John <[EMAIL PROTECTED]> wrote: Would someone know how to disable SMM in this BIOS? There's no generic way. Try disabling USB keyboard emulation and any unused peripherals. Also google "RTAI disable SMM". > Is this a laptop? They are plagued with SMM problems... No it is an "

Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-28 Thread John
Lee Revell wrote: John wrote: I'm runnning 2.6.20.3 patched with -rt8 (and glibc 2.3.6). http://people.redhat.com/mingo/realtime-preempt/older/patch-2.6.20-rt8 I've written a program to highlight a phenomenon I don't understand. This system includes a PCI board that provides data at ~38 Mbit

Re: 2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-27 Thread Lee Revell
On 3/27/07, John <[EMAIL PROTECTED]> wrote: I'm runnning 2.6.20.3 patched with -rt8 (and glibc 2.3.6). http://people.redhat.com/mingo/realtime-preempt/older/patch-2.6.20-rt8 I've written a program to highlight a phenomenon I don't understand. This system includes a PCI board that provides data

2.6.20.3-rt8 - DMA suffers excessive delay periodically

2007-03-27 Thread John
Hello everyone, I'm runnning 2.6.20.3 patched with -rt8 (and glibc 2.3.6). http://people.redhat.com/mingo/realtime-preempt/older/patch-2.6.20-rt8 I've written a program to highlight a phenomenon I don't understand. This system includes a PCI board that provides data at ~38 Mbit/s. I request dat