Re: packet drops and zero copy filtering?

[Richard Sharpe <rsharpe () richardsharpe com>]

On Mon, 14 Jul 2003, Ben Greear wrote:

> Richard Sharpe wrote:
> > On Sun, 13 Jul 2003, Ben Greear wrote:
>
> > > Seems you cannot use sendfile when reading from a socket, so can't
> > > capture like this.  It will definately need a kernel module.
> >
> >
> > Well, the first poster's question does not make any sense, but it does not 
> > seem to me that the claim that you can't use sendfile when reading from a 
> > socket makes any sense either. I thought Linux's sendfile was symmetric in 
> > that regard, unlike, say, sendfile under FreeBSD, where you cannot use 
> > sendfile to read from a socket.
>
>  From the sendfile man page on RH 9
>
>         Presently the descriptor from which data is read cannot correspond to a
>         socket, it must correspond to a file which supports mmap()-like  opera-
>         tions.
>
> So, make sense or not, it don't work.

My apologies then. I thought that Linux could do that. Guess I will have 
to think about the FreeBSD version I did could apply to Linux :-) 
 
Regards
-----
Richard Sharpe, rsharpe[at]ns.aus.com, rsharpe[at]samba.org, 
sharpe[at]ethereal.com, http://www.richardsharpe.com

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