Re: 2.6.14-rc4-rt1

[Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>]

On Wed, 2005-10-12 at 09:10 +0200, Ingo Molnar wrote:
> another thing: might be worth trying PREEMPT_RT too, maybe it makes a 
> difference.

On "depmod -a" I'm getting:
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/jffs2/jffs2.ko needs unknown symbol __down_read
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/jffs2/jffs2.ko needs unknown symbol __up_write
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/jffs2/jffs2.ko needs unknown symbol __up_read
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/jffs2/jffs2.ko needs unknown symbol __down_write
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/jffs2/jffs2.ko needs unknown symbol compat_init_rwsem
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __down_read
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __down_write_trylock
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __up_write
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __up_read
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __downgrade_write
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __down_write
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol compat_init_rwsem
WARNING: /lib/modules/2.6.13-0.11.rdt.rhfc4.ccrmasmp/kernel/fs/xfs/xfs.ko needs unknown symbol __down_read_trylock

I'll report after I try to boot into it. 

> Also, i noticed an unrelated .config thing: while you have 
> PREEMPT_DESKTOP, PREEMPT_BKL and irq/softirq threading turned on, you 
> dont have PREEMPT_RCU enabled. PREEMPT_RCU is pretty useful, it can get 
> rid of a number of latency sources. Might be worth a try for your 
> kernel.

I tried PREEMPT_RCU=y and then HIGH_RES_TIMERS=y with no effects. I also
turned off ntpd at Thomas's request (no change). 

I could not boot the up version of the kernel, it hangs early, I'll try
to see why (weird). 

-- Fernando


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