You can set the pci latency from userspace. See this page for more info: http://www.mythtv.org/wiki/index.php/PCI_Latency
If you are trying to do it in some automated fashion, there's probably a way to convince udev or modprobe.conf to do it somehow. --Brian Jackson On Mar 14, 2007, at 7:53 PM, pomidorabelisima wrote: > 01:23:10 up 3 days, 13:28,.. > 2.6.20.2-el5 > > with these exeptions: > i2c_adapter i2c-3: sendbytes: error - bailout. > msp3400 3-0040: I/O error #0 (read 0x10/0x200) > ivtv1 warning: CX2341X_DEC_GET_TIMING_INFO took 39 > jiffies (300 per HZ) > ivtv1 warning: IVTV_IOC_DEC_FLUSH is obsolete! > NO hangups! > > /proc/interrupts: > 19: 107483889 IO-APIC-fasteoi ohci1394, ivtv1 > 20: 6869535 IO-APIC-fasteoi ivtv0, nvidia > > lspci: > Flags: bus master, medium devsel, latency 252, IRQ 20 > Flags: bus master, medium devsel, latency 252, IRQ 19 > 01:07.0 Multimedia video controller: Internext > Compression Inc iTVC16 > (CX23416) MPEG-2 Encoder (rev 01) > 01:09.0 Multimedia video controller: Internext > Compression Inc iTVC15 > MPEG-2 Encoder (rev 01) > > /etc/rc.local: > /sbin/setpci -v -s 01:07.0 latency_timer=ff > /sbin/setpci -v -s 01:09.0 latency_timer=ff > > /usr/src/linux-2.6.20.2/.config: > CONFIG_HZ_300: > > 300 Hz is a good compromise choice allowing server > performance > while also showing good interactive > responsiveness even > on SMP and NUMA > systems and exactly > dividing by both PAL and > NTSC frame rates > for video and multimedia work. > > proposal for more latency tuning, like: > ivtv > parm: ivtv_pci_latency:Change the PCI latency to 64 if > lower: 0 = No, 1 > = Yes, 2 = Max(255) > Default: Yes (int) > or even more: > 0 = No = 32 > 1 = Yes = 64 > 2 = Hihg = 128 > 3 = Max = 255/252/248 > > /etc/modprobe.conf > ivtv ivtv_pci_latency=Max > or > ivtv ivtv_pci_latency=High,Max(150,350) > ..something like that > > > > ______________________________________________________________________ > ______________ > Bored stiff? Loosen up... > Download and play hundreds of games for free on Yahoo! Games. > http://games.yahoo.com/games/front > > _______________________________________________ > ivtv-devel mailing list > ivtv-devel@ivtvdriver.org > http://ivtvdriver.org/mailman/listinfo/ivtv-devel _______________________________________________ ivtv-devel mailing list ivtv-devel@ivtvdriver.org http://ivtvdriver.org/mailman/listinfo/ivtv-devel
