Messages in this thread | | | Date | Fri, 20 Aug 2004 12:27:32 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] voluntary-preempt-2.6.8.1-P4 |
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* Lee Revell <rlrevell@joe-job.com> wrote:
> 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.
well, 9 msecs is still not nice. I've been able to trigger larger than 10msec latencies too on a 2 GHz box.
> 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.
hm, tcp_collapse() in net/ipv4/tcp_input.c. Could you try to just return from that function? Collapsing skbs of a given socket is not a necessary functionality (it is only a 'nice' thing to have in OOM situations) and it indeed can introduce quite high latencies.
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