From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: Maximum no of bytes Ethernet can transfer at a time ??
Date: Thu, 28 Apr 2011 08:40:25 +0200
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To: Ajit <ajitsa_bes@yahoo.com>
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Le jeudi 28 avril 2011 =C3=A0 06:36 +0000, Ajit a =C3=A9crit :
> Ajit <ajitsa_bes <at> yahoo.com> writes:
>=20
> >=20
> > Eric Dumazet <eric.dumazet <at> gmail.com> writes:
> >=20
> > > Sure, check your syscall returns values, and search for SO_RCVBUF=
 &
> > > SO_SNDBUF   (man 7 socket)
> > >=20
> > > --
> >=20
> > okies..I dont know exactly how to use those but I will google and t=
ry it..
> > will post my result after some time.
> >=20
> > Thank you
> >=20
> > --
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> >=20
> >=20
>=20
>=20
> hi sir,
> I tried out something as you said.
>=20
> I introduces this lines in my code,
>=20
> getsockopt(s,SOL_SOCKET,SO_RCVBUF,&optval,&optlen);
> printf("The value of optlen is %d\n",optlen);
>=20

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

int optval;
socklen_t optlen =3D sizeof(optval);
getsockopt(s,SOL_SOCKET,SO_RCVBUF, &optval, &optlen);
printf("The value of optval is %d\n", optval);

> It always displays 4.
>=20
> I really have no idea about it. Do I need to use setsockopt options i=
n my
> receiver code ??
> If so, what difference will it make ??

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