Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

Alexey Kuznetsov
2006-09-18T22:00:45Z

Hello!

> Please think about it this way:
> suppose you haave a heavily loaded router and some network problem is to
> be diagnosed. You run tcpdump and suddenly router becomes overloaded (by
> switching to timestamp-it-all mode

I am sorry. I cannot think that way. :-)

Instead of attempts to scare, better resend original report,
where you said how much performance degraded, I cannot find it.

* I do see get_offset_pmtmr() in top lines of profile. That's scary enough.
* I do not undestand what the hell dhcp needs timestamps for.
* I do not listen any suggestions to screw up tcpdump with a sysctl.
Kernel already implements much better thing then a sysctl.
Do not want timestamps? Fix tcpdump, add an options, submit the
patch to tcpdump maintainers. Not a big deal.

Alexey