On Wed, 2007-05-09 at 19:42 +0530, Anant Nitya wrote:
> Hi,
> Ever since I upgrade to 2.6.21/.1, system log is filled with following
> messages if I enable CONFIG_NO_HZ=y, going through archives it seems ingo
> sometime back posted some patch and now it is upstream, but its not helping
> here. If I disable NOHZ by kernel command line nohz=off this problem
> disappears. This system is P4/2.40GHz/HT with SMP/SMT on in kernel config.
> One more thing that I noticed is this problem only arises while using X or
> network otherwise plain command line with no network access don't trigger
> this with nohz=on.
Is this independent of the load on the system ? i.e. : What happens if
you only use the console and run a kernel compile with -j4 ?
> dumdum@hahakaar [~]$ >> grep NOHZ /var/log/messages
> May 8 03:38:14 rudra kernel: [ 419.271195] NOHZ: local_softirq_pending 02
> May 8 03:38:14 rudra kernel: [ 419.271663] NOHZ: local_softirq_pending 02
The patch below ratelimits the printk output, so your syslog is not
flooded anymore.
tglx
Index: linux-2.6.21/kernel/time/tick-sched.c
===================================================================
--- linux-2.6.21.orig/kernel/time/tick-sched.c
+++ linux-2.6.21/kernel/time/tick-sched.c
@@ -167,9 +167,15 @@ void tick_nohz_stop_sched_tick(void)
goto end;
cpu = smp_processor_id();
- if (unlikely(local_softirq_pending()))
- printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
- local_softirq_pending());
+ if (unlikely(local_softirq_pending())) {
+ static int ratelimit;
+
+ if (ratelimit < 10) {
+ printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
+ local_softirq_pending());
+ ratelimit++;
+ }
+ }
now = ktime_get();
/*
-
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