Messages in this thread | | | Subject | Re: [patch] voluntary-preempt-2.6.8.1-P4 | From | Lee Revell <> | Date | Fri, 20 Aug 2004 05:14:03 -0400 |
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On Fri, 2004-08-20 at 04:13, Ingo Molnar wrote: > * Lee Revell <rlrevell@joe-job.com> wrote: > > > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P4 > > > > I think I am seeing those weird ~1 ms latencies still (actually I am not > > sure I saw before now): > > > > http://krustophenia.net/testresults.php?dataset=2.6.8.1-P4#/var/www/2.6.8.1-P4/kswapd_latency_trace.txt > > this is a 9 msec latency in fact. I know what's going on - it's the > get_swap_page() locking - i looked at it once already but there's no > immediate silver arrow. As we allocate more and more swap entries the > longer the scan gets. >
This is an extreme load situation, so I don't think it will be a real-world problem. I have not seen it under any normal workload.
What about this one:
http://krustophenia.net/testresults.php?dataset=2.6.8.1-P4#/var/www/2.6.8.1-P4/netif_receive_skb_latency_trace.txt
This appears during normal use.
Lee
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