realtime-preempt-2.6.12-final-V0.7.51-01 compile error and more problems

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Compilation stops at this point:

make[1]: `arch/i386/kernel/asm-offsets.s' is up to date.
  CHK     include/linux/compile.h
  CHK     usr/initramfs_list
  CC      net/ipv4/netfilter/ip_conntrack_proto_tcp.o
net/ipv4/netfilter/ip_conntrack_proto_tcp.c: In function `tcp_print_conntrack': net/ipv4/netfilter/ip_conntrack_proto_tcp.c:333: error: `tcp_lock' undeclared (first use in this function) net/ipv4/netfilter/ip_conntrack_proto_tcp.c:333: error: (Each undeclared identifier is reported only once net/ipv4/netfilter/ip_conntrack_proto_tcp.c:333: error: for each function it appears in.) net/ipv4/netfilter/ip_conntrack_proto_tcp.c:333: warning: type defaults to `int' in declaration of `type name'
etc. etc..

Most likely it depends on the redefinition of DECLARE_RWLOCK in lockhelp.h


More problems....

Patch 7.50-48 has been the first rt kernel that compiled and booted cleanly on my system.
I'm testing the rt kernels because I want to use jack as my system sound
mixer/router
and to record lp's with my ice1712-based sound card. I have no rt
requrements, of course,
but I want to get rid of xruns. Kernel 2.6.12 vanilla is quite good
already (a big improvement
over previous kernels) but still ...

Patch 7.50-48 been running for two days now and seems pretty stable but:

1) My logs are filled with Apic errors all like this

Jul  5 04:30:01 linux kernel: APIC error on CPU0: 02(02)

every 2 seconds, or minute, at random. I've never seen these messages before with vanilla kernels,
so it's a bit weird.

2) Whenever I play an mp3 or watch a movie (through jack) I get thousands of times these errors in the logs
Jul 5 20:45:56 linux kernel: `IRQ 8'[828] is being piggy.
need_resched=0, cpu=0
Jul  5 20:45:56 linux kernel: Read missed before next interrupt
Jul  5 20:45:56 linux kernel: wow!  That was a 12 millisec bump
Jul  5 20:45:56 linux kernel: bug in rtc_read(): called in state S_IDLE!
Jul 5 20:45:56 linux kernel: `IRQ 8'[828] is being piggy. need_resched=0, cpu=0
Jul  5 20:45:56 linux kernel: Read missed before next interrupt
Jul  5 20:45:56 linux kernel: wow!  That was a 3 millisec bump
Jul  5 20:45:56 linux kernel: bug in rtc_read(): called in state S_IDLE!

This is a known issue, RTC interrupts are missed. I have noticed it many times when ntp is running. It stops working after a few minutes of playing when the the error exceeds 500 PPM. But I thought that ntp compared external reference clocks to the system timer, so the system was missing int 0, not int 8. My mobo has a crappy timer anyway. I had to reduce the tick to 9934
in order to allow ntp to run.

3) I had to disable polling of the cpu temperature by kacpid because whenever it did the sound stopped for 1-3 seconds. The polling took longer and longer after a few hours of uptime. The nice thing is, it caused no xruns. Kernel 2.6.12 vanilla has the same problem, though.
4) Xruns occur every 10-60 minutes even when the system is practically
idle (no playback
or recording). When copying large files (between sata disks on two
sil3112 controllers)
xruns frequency is much higher. When sound is used xruns occur every 2
or 20 minutes.

This is a nForce2-mobo (Abit NF7-S V 2.0), Athlon 2800, 1 GB Ram, Terratec DMX6Fire, nVidia 4200 video card, 2 sil3112 sata controllers with 3 disks,etc. SuSE 9.1 with KDE 3.4 and
uptodate jack, xmms, mplayer, sound libraries and recording apps.

If more details are needed or I can perform some tests, feel free to ask.

Cheers,

		Carlo Scarfoglio



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