Messages in this thread | | | Date | Wed, 14 May 2008 20:56:04 -0700 | From | Andrew Morton <> | Subject | Re: NET_SCHED cbq dropping too many packets on a bonding interface |
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(cc netdev)
On Thu, 15 May 2008 12:25:19 +0930 "Kingsley Foreman" <kingsley@internode.com.au> wrote:
> Ive been using qdisc for quite a while without any problems, > I just rebuilt a gentoo box with 2.6.25 kernel that does a lot of traffic > ~1000mbits+ over a bonded interface > > Im however seeing a big problem with cbq class dropping packets for no > reason i can see, and it is causing a lot of speed issues. > > the basic config is this > _____________________________________________________________________ > /sbin/tc qdisc del dev bond0 root > /sbin/tc qdisc add dev bond0 root handle 1 cbq bandwidth 2000Mbit avpkt 1000 > cell 8 > /sbin/tc class change dev bond0 root cbq weight 200Mbit allot 1514 > > /sbin/tc class add dev bond0 parent 1: classid 1:1280 cbq bandwidth 2000Mbit > rate 1200Mbit weight 120Mbit prio 1 allot 1514 cell 8 maxburst 120 minburst > 1 minidle 0 avpkt 1000 bounded > /sbin/tc filter add dev bond0 parent 1:0 protocol ip prio 300 route to 5 > classid 1:1280 > > /sbin/tc class add dev bond0 parent 1: classid 1:1281 cbq bandwidth 2000Mbit > rate 400Mbit weight 40Mbit prio 6 allot 1514 cell 8 maxburst 120 minburst 1 > minidle 0 avpkt 1000 bounded > /sbin/tc filter add dev bond0 parent 1:0 protocol ip prio 300 route to 6 > classid 1:1281 > ____________________________________________________________________ > > So there is a lot of bandwidth handed out but it is still dropping a lot of > packets for very small ammounts of traffic eg 300mbits. > > However the biggest problem im seeing is if i just do this > > __________________________________________________________________ > /sbin/tc qdisc del dev bond0 root > /sbin/tc qdisc add dev bond0 root handle 1 cbq bandwidth 2000Mbit avpkt 1000 > cell 8 > /sbin/tc class change dev bond0 root cbq weight 200Mbit allot 1514 > ___________________________________________________________________ > > after 30sec I get results like > ___________________________________________________________________ > > ### bond0: queueing disciplines > > qdisc cbq 1: root rate 2000Mbit (bounded,isolated) prio no-transmit > Sent 574230043 bytes 407156 pkt (dropped 2524, overlimits 0 requeues 0) > rate 0bit 0pps backlog 0b 0p requeues 0 > borrowed 0 overactions 0 avgidle 3 undertime 0 > > ### bond0: traffic classes > > class cbq 1: root rate 2000Mbit (bounded,isolated) prio no-transmit > Sent 574330783 bytes 407225 pkt (dropped 2525, overlimits 0 requeues 0) > rate 0bit 0pps backlog 0b 0p requeues 0 > borrowed 0 overactions 0 avgidle 3 undertime 0 > __________________________________________________________________ > > I can't for the life if me work out why it is dropping so many packets for > while doing so little traffic when i enable cbq the transfer rate drops by > approx 30%, any help would be great, and any improvements to my command > lines would be good also. > > > Kingsley Foreman
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