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Re: [PATCH] Avoid gettimeofday when not needed

To: P@xxxxxxxxxxxxxx
Subject: Re: [PATCH] Avoid gettimeofday when not needed
From: Andi Kleen <ak@xxxxxx>
Date: 31 Mar 2004 15:53:25 +0200
Date: Wed, 31 Mar 2004 15:53:25 +0200
Cc: Andi Kleen <ak@xxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <406AB7F6.6010805@xxxxxxxxxxxxxx>
References: <200403311201.i2VC13D19579@xxxxxxxxxxx> <406AB7F6.6010805@xxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: Mutt/1.4.1i
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

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