Very Computer

by **to..** » Fri, 05 May 2006 17:50:34

Kernel 2.6.16.12, iptables 1.3.4
imq kernel module loads correctly with 4 interfaces. When my system
works lsmod show imq usage equals few thousands

router:~# lsmod |grep imq
imq 3588 14237

Morover usage of imq module grows during my system works. I use only 2
imq interfaces
6: imq0: <NOARP,UP> mtu 1500 qdisc htb qlen 30
link/void
7: imq1: <NOARP,UP> mtu 1500 qdisc htb qlen 30
link/void

When I observe strange behaviour of imq module all fraffic shaping,
that uses imq seems to work fine. Any ideas?

by **Andy Furnis** » Tue, 09 May 2006 04:54:00

> Kernel 2.6.16.12, iptables 1.3.4
> imq kernel module loads correctly with 4 interfaces. When my system
> works lsmod show imq usage equals few thousands

> router:~# lsmod |grep imq
> imq 3588 14237

> Morover usage of imq module grows during my system works. I use only 2
> imq interfaces
> 6: imq0: <NOARP,UP> mtu 1500 qdisc htb qlen 30
> link/void
> 7: imq1: <NOARP,UP> mtu 1500 qdisc htb qlen 30
> link/void

> When I observe strange behaviour of imq module all fraffic shaping,
> that uses imq seems to work fine. Any ideas?

IMQ is a considered a hack and so not in kernel.

Since 2.6.16 you can use IFB which can cover most but not all IMQ
functionality.

I still use IMQ and it seems that the ref count is dropped packets
(+backlog if any). I suppose it's because they are stolen from netfilter
and when dropped by queues they are released in a way which doesn't
expect them to have been stolen from netfilter.

Andy.

Very Computer

imq usage grows dramatically

imq usage grows dramatically

imq usage grows dramatically