On 01/06/2008 11:38 AM, Lee Howard wrote: > Len Brown wrote: >> On Wednesday 02 January 2008 09:11, Dominique Michel wrote: >> >>> Le Sat, 29 Dec 2007 10:40:20 -0800, >>> Lee Howard <[EMAIL PROTECTED]> a écrit : >>> >>> >>> >>>> # cat /proc/interrupts >>>> CPU0 0: 1051464247 IO-APIC-edge timer >>>> 1: 8 IO-APIC-edge i8042 >>>> 8: 0 IO-APIC-edge rtc >>>> 9: 0 IO-APIC-fasteoi acpi >>>> 12: 104 IO-APIC-edge i8042 >>>> 14: 9414304 IO-APIC-edge ide0 >>>> 16: 1051172722 IO-APIC-fasteoi wct4xxp >>>> 19: 1 IO-APIC-fasteoi eth1 >>>> 21: 158008518 IO-APIC-fasteoi eth0 >>>> 22: 6974044 IO-APIC-fasteoi libata >>>> 23: 7071112 IO-APIC-fasteoi libata >>>> NMI: 0 >>>> LOC: 1051371544 >>>> ERR: 0 >>>> >>>> >>>> >>> Based on that, you may want to use rtirq. It is a boot script (need >>> schedutils >>> as dependency) with associated config scripts. >>> http://alsa.opensrc.org/Rtirq >>> >>> In /etc/conf.d/rtirq, you will find: >>> >>> # IRQ thread service names >>> # (space separated list, from higher to lower priority). >>> RTIRQ_NAME_LIST="rtc snd usb i8042" >>> >>> The most important things is that the devices listed here doesn't >>> have any >>> shared IRQ with some other device and that the rtc remain the first >>> listed >>> device (the one with the higer priority), or the system will hang >>> soon or later. >>> >>> This setup is for audio workstation but is very easy to adapt to any >>> kind of >>> work. >>> >>> >> >> I've got no experience with the thread priority thing above. >> However, the better way to handle quality of service contention >> is to not do the things you don't care about. >> >> Does the system really need HZ=1000? you could slow that down to 100, >> or run CONFIG_NO_HZ to reduce it even more... >> Also, on a UP, the LAPIC timer interrupt is redundant -- >> you could build your kernel w/o APIC support or boot with nolapic. >> >> This would get rid of the only interrupts which are frequent >> enough to be competing with the device, clock ticks. > > If I boot with nolapic then XT-PIC is used, and the wcfxo device ends up > sharing an IRQ with libata which results in worse performance than with > it the way that it is. >
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