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From Sergey Kondratyev <>
Subject Re: Oftopic: ksoftirqd after ddos take more cpu? as result cassandra latensy very high
Date Sun, 01 Jul 2012 17:33:24 GMT
it is not related to cassandra/ddos.
it is kernel problems due to leap second. See

On Sun, Jul 1, 2012 at 1:05 PM, ruslan usifov <> wrote:
> Hello
> We was under ddos attack, and as result we got high ksoftirqd activity
> - as result cassandra begin answer very slow. But when ddos was gone
> high ksoftirqd activity still exists, and dissaper when i stop
> cassandra daemon, and repeat again when i start cassadra daemon, the
> fully resolution of problem is full reboot of server. What this can be
> (why ksoftirqd begin work very intensive when cassandra runing - we
> disable all working traffic to cluster but this doesn't help so this
> is can't be due heavy load )? And how to solve this?
> PS:
>      OS ubuntu 10.0.4 (
>      cassandra 1.0.10
>      java 1.6.32 (from oracle)

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