Re: [PATCH] Avoid gettimeofday when not needed

[Andi Kleen <ak@xxxxxx>]

On Wed, Mar 31, 2004 at 01:22:14PM +0100, P@xxxxxxxxxxxxxx wrote:
> Andi Kleen wrote:
> >This patch implements an optimization I proposed a long time 
> >ago. gettimeofday can be quite costly and it currently is 
> >on the fast path of every packet. Normally the packet time stamp
> >is not needed (e.g. TCP doesn't use it), except for tcpdump
> >and a few applications.
> 
> Will this work for apps that don't use a seperate syscall
> to get the timestamp. Like CONFIG_PACKET_MMAP for e.g?

The mmap will enable the time stamp, until the socket is closed.

-Andi