Re: [Devil-Linux-discuss] Bad routing performance - only app. 100MBit/s

Uwe,

It's been a very long time since I messed with that, but my first thought is
the TCP window size.
Bump that up significantly and check what happens.

How's the CPU utilization doing on the firewall during the test?

One stupid question, just in case: the slow host, is it by any chance using
a 100mbit card, wrong network cable, or has been throttled down somehow?

Best Regards
  Heiko Zuerker

-----Original Message-----
From: udo...@al... [mailto:udo...@al...] 
Sent: Wednesday, November 27, 2013 12:35 PM
To: dev...@li...
Subject: [Devil-Linux-discuss] Bad routing performance - only app. 100MBit/s

Hi,
I have an strange issue on a devil-linux-box with 5 gigabit-nics.
 From each network I got an normal performance to/from the firewall:
iperf shows 781 Mbits/sec

a little bit less to the firewall nic from the other lan:
iperf -c 192.168.225.254
775 Mbits/sec

But to an host inside the other lan the performance drop:
iperf -c 192.168.225.2
94.3 Mbits/sec

The network connection or the host seems be ok, because from the firewall I
got normal values (it's an VM):
iperf -c 192.168.225.2
643 Mbits/sec
725 Mbits/sec - to an physical host

The big question: why I'm not able to reach this speed through the
firewall??

The firewall has an 4 core i5 CPU M 520 @ 2.40GHz

and the NICs are:
01:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network
Connection
02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network
Connection
03:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network
Connection
04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network
Connection
05:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network
Connection

Devil-Linux 1.6.3-i686

Are there any trick to use only one core for iptables/routing???


Any ideas??

Best regards

Udo

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