Re: Route cache performance under stress

On Tue, 10 Jun 2003, David S. Miller wrote:

   From: Ralph Doncaster [off-list ref]
   Date: Tue, 10 Jun 2003 19:58:47 -0400 (EDT)

   On Tue, 10 Jun 2003, David S. Miller wrote:

   > Every packet records a timestamp.

   I'm not aware of anything in IP routing that requires a timestamp for
   every packet.  To me it sounds like we could rip that out too.

Guess you never run tcpdump nor use packet schedulers.

So because some (in the case of a core router almost none) of the packets
will need a timestamp, you do it for every single one of them?

This sounded so unbelievable to me that I took a quick look at the code to
see what I'd have to do to get rid of it.  It appears that gettimeofday is
not called for every packet; just for ICMP timestamp requests and for IP
options (ip_options_build and ip_options_compile).

-Ralph