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SubjectRe: 2.6.8.1-mm3 lockmeter on 512p w/kernbench
On Fri, Aug 20, 2004 at 02:04:32PM -0400, Jesse Barnes wrote:
| More lockstats. dcache is obviously still there, but for some reason the rcu
| stuff is gone (I didn't apply Manfred's patches). I must have done some
| stuff prior to collecting the lockstat data last time that caused it.

...[snip]...

| SPINLOCKS HOLD WAIT
| UTIL CON MEAN( MAX ) MEAN( MAX )(% CPU) TOTAL NOWAIT SPIN RJECT NAME
|
| 3.1% 2.2us( 102ms) 12ms( 488ms)(35.1%) 320195677 96.9% 3.1% 0.00% *TOTAL*

...[snip]...

| 31.2% 95.2% 71us( 10ms) 37ms( 146ms)(30.2%) 2828650 4.8% 95.2% 0% rcu_check_quiescent_state+0xf0

Looks like the RCU contention is still there.

I ran some bench marks at 512p on a 2.6.5 SUSE kernel with and without
Manfred's patches 4 and 5 added (the SUSE kernel already has the 3
accepted RCU patches), and the results were very promising. I think
we'll want to pursue getting these other two RCU patches accepted.

I'll to get some lockmeter numbers on a latest -mm kernel next week.

Greg
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