[PATCH] Set TOS (TCLASS) bits under ipv6

[Dave Taht]

It would be mildly better to set the bulk bit for scp transfers where possible.

On Wed, Sep 28, 2011 at 4:58 AM, Dave Taht <dave.taht at gmail.com> wrote:
> Setting the TCLASS (TOS) field requires different setsockopt
> params on ipv6 than ipv4.
>
> as per:
>
> http://www.bufferbloat.net/projects/cerowrt/issues/249
> ---
>  dbutil.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/dbutil.c b/dbutil.c
> index b3a119f..2739d2f 100644
> --- a/dbutil.c
> +++ b/dbutil.c
> @@ -161,10 +161,12 @@ static void set_sock_priority(int sock) {
>        val = 1;
>        setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val));
>
> -       /* set the TOS bit. note that this will fail for ipv6, I can't find any
> -        * equivalent. */
> +       /* bruteforce the TOS bit for ipv4 or ipv6. Note that for versions of
> +           Linux prior to 2.6.39 this will stomp on the ECN bit under IPv6 */
> +
>  #ifdef IPTOS_LOWDELAY
>        val = IPTOS_LOWDELAY;
> +       setsockopt(sock, IPPROTO_IPV6, IPV6_TCLASS, (void*)&val, sizeof(val));
>        setsockopt(sock, IPPROTO_IP, IP_TOS, (void*)&val, sizeof(val));
>  #endif
>
> --
> 1.7.4.1
>
>
> --
> Dave Täht
> SKYPE: davetaht
> US Tel: 1-239-829-5608
> http://the-edge.blogspot.com
>



-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com