In article [ref] (at Mon, 31 Jan 2005 01:29:10 +0900 (JST)), YOSHIFUJI Hideaki / 吉藤英明 [off-list ref] says:

quoted

It appears that the expiry seconds here are actually in units of
10 seconds.  Maybe someone's double-converting kernel Hz to user Hz?

Kernel exports in USER_HZ.
iproute2 seem to convert it again; workaround is to do "export HZ=100".

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This is example. Of course, this depends on your arch.

--yoshfuji