Re: [PATCH] reduce inter-node balancing frequency

[Jesse Barnes]

On Friday, July 16, 2004 11:00 pm, Nick Piggin wrote:
> Out of interest, what sort of performance problems are you seeing with
> this high rate of global balancing? I have a couple of patches to cut down
> runqueue locking to almost zero in interrupt paths, although I imagine the
> main problem you are having is pulling a cacheline off every remote CPU
> when calculating runqueue loads?

John might remember the details, I didn't get a backtrace this time.  When we 
boot with the default values on a 512p system, it livelocks shortly after 
init starts.  I *think* what's happening is that a the global rebalance value 
is shorter than the time it takes to do the global rebalance, due to 
cacheline contention.

Jesse
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/