Re: Maximum no of bytes Ethernet can transfer at a time ??

[Eric Dumazet <eric.dumazet@gmail.com>]

Le jeudi 28 avril 2011 à 06:36 +0000, Ajit a écrit :
> Ajit <ajitsa_bes <at> yahoo.com> writes:
> 
> > 
> > Eric Dumazet <eric.dumazet <at> gmail.com> writes:
> > 
> > > Sure, check your syscall returns values, and search for SO_RCVBUF &
> > > SO_SNDBUF   (man 7 socket)
> > > 
> > > --
> > 
> > okies..I dont know exactly how to use those but I will google and try it..
> > will post my result after some time.
> > 
> > Thank you
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe netdev" in
> > the body of a message to majordomo <at> vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 
> > 
> 
> 
> hi sir,
> I tried out something as you said.
> 
> I introduces this lines in my code,
> 
> getsockopt(s,SOL_SOCKET,SO_RCVBUF,&optval,&optlen);
> printf("The value of optlen is %d\n",optlen);
> 

Oh well, netdev is really not the place to discussion like that.

int optval;
socklen_t optlen = sizeof(optval);
getsockopt(s,SOL_SOCKET,SO_RCVBUF, &optval, &optlen);
printf("The value of optval is %d\n", optval);

> It always displays 4.
> 
> I really have no idea about it. Do I need to use setsockopt options in my
> receiver code ??
> If so, what difference will it make ??

It makes sure your socket can really receive enough messages (or kernel
drops them)