Hi Vlad, On Thu, 2012-11-29 at 15:49 -0500, Vlad Yasevich wrote: > On 11/29/2012 03:35 PM, Dilip Daya wrote: > > Hi, > > > > Testing kernel 3.2.32 x86_64 environment show the sctp sysctl variables: > > > > - net.sctp.rto_initial, > > - net.sctp.rto_min, > > - net.sctp.rto_max > > > > are not overriding the hard-coded recommended values of: > > - http://lxr.linux.no/linux+v3.2.34/include/net/sctp/constants.h#L276 > > > > I've confirmed the following values are correct to what I need modified: > > - /proc/sys/net/sctp/rto_initial > > - /proc/sys/net/sctp/rto_min > > - /proc/sys/net/sctp/rto_max > > > > If I change the hard-coded values and rebuild sctp they take effect. Is > > this an issue on my end or is this a sctp sysctl issue? > > > > Thanks, > > -DilipD. > > > > Dilip > > I am not sure what you mean... Are you saying that issuing > sysctl -w net.sctp.rto_initial=100 > doesn't change the value of rto_initial shown in /proc/sys/net/sctp? No, it does change the value in /proc/sys/net/sctp but not picked up by sctp associations. Only default recommended values are picked up, i.e. # sysctl -a 2>/dev/null | grep ".rto_" net.ipv4.tcp_frto_response = 0 net.sctp.rto_initial = 25 net.sctp.rto_min = 20 net.sctp.rto_max = 30 net.sctp.rto_alpha_exp_divisor = 3 net.sctp.rto_beta_exp_divisor = 2 # cat /proc/sys/net/sctp/rto_max 30 # cat /proc/sys/net/sctp/rto_min 20 # cat /proc/sys/net/sctp/rto_initial 25 Selective sctp debug: [ 206.783286] sctp_init_sock: net_params->rto_min: 1000, net_params->rto_initial: 3000, net_params->rto_max: 60000 [ 206.783291] sctp_init_sock: sp->rtoinfo.srto_min: 1000, sp->rtoinfo.srto_initial: 3000, sp->rtoinfo.srto_max: 60000 [ 206.783403] sctp_association_init: sp->rtoinfo.srto_min: 1000, sp->rtoinfo.srto_initial: 3000, sp->rtoinfo.srto_max: 60000 [ 206.783407] sctp_association_init: asoc->rto_min: 250, asoc->rto_initial: 750, asoc->rto_max: 15000 [ 206.783426] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.783993] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.784008] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.784019] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.784028] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.784038] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.784047] sctp_transport_init: net_params->rto_initial: 3000, peer->rto: 750 [ 206.784731] sctp_transport_update_rto: transport: ffff88011e1b0400, rtt: 0, srtt: 0 rttvar: 1, rto: 250, rto-msecs: 1000, rto_min: 250, rto_max: 15000 ... # cat /proc/net/sctp/remaddr ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX REM_ADDR_RTX START 192.168.2.62 1 1 250 5 0 0 # cat /proc/net/sctp/assocs_info | grep "R:" R:192.168.2.62 1 1500 0 5 11832 0 21040 250 0 1 0 i.e. Default hard-coded recommended values are: rto_min = 1000 msec = 1000/4 = 250 jiffies rto_initial = 3000 msec = 3000/4 = 750 jiffies rto_max = 60000 msec = 60000/4 = 15000 jiffies => Seems sctp sysctl rto_ variables do not effect. -DilipD. > > -vlad > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-sctp" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
