Messages in this thread | | | Date | Tue, 24 Jan 2006 10:23:30 +0100 | From | Ingo Molnar <> | Subject | Re: RCU latency regression in 2.6.16-rc1 |
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* Paul E. McKenney <paulmck@us.ibm.com> wrote:
> > Have not tested yet but it appears that will reduce it substantially: > > > > $ grep "dst_destroy (dst_rcu_free)" /proc/latency_trace | wc -l > > 3027 > > > > This implies the latency would be reduced to ~4ms, still not great but > > it will be overshadowed by rt_run_flush/rt_garbage_collect. > > The other patch to try would be Dipankar Sarma's patch at: > > http://marc.theaimsgroup.com/?l=linux-kernel&m=113657112726596&w=2 > > This patch was primarily designed to reduce memory overhead, but given > that it tends to reduce batch size, it should also reduce latency.
if this solves Lee's problem, i think we should apply this as a fix, and get it into v2.6.16. The patch looks straightforward and correct to me.
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