Re: Re: Re: limited network bandwidth with 3.2.x kernels

Eric Dumazet
2012-02-14T05:55:07Z

Le mardi 14 février 2012 à 01:49 +0200, alekcejk@googlemail.com a
écrit :
> В сообщении от Понедельник 13 февраля 2012 23:44:16 вы написали:
> > Le lundi 13 février 2012 à 21:18 +0100, Eric Dumazet a écrit :
> > I wonder if the other side of your link believes link is in half duplex
> > mode... Could you please check ?
>
> I have no access to other side, the only I can check is ethtool and mii-diag (kernel-3.2.3):

I have seen numerous duplex mismatches in some data centers after a
reboot. One side believes link is full duplex, the other side believes
its half duplex.

You could setup a pktgen/hping3 to send 2.000 small frames per second to
your gateway and check if you still can download at normal speeds.

hping3 --udp -s 9 -p 9 -i u500 192.168.1.1