linux-kernel - Re: Network performance

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Date:	Mon, 29 Mar 2010 17:27:29 +0200
From:	Michal Simek <michal.simek@...alogix.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	John Williams <john.williams@...alogix.com>,
	netdev@...r.kernel.org, Grant Likely <grant.likely@...retlab.ca>,
	John Linn <John.Linn@...inx.com>,
	"Steven J. Magnani" <steve@...idescorp.com>,
	Arnd Bergmann <arnd@...db.de>, akpm@...ux-foundation.org
Subject: Re: Network performance - iperf

Michal Simek wrote:
> Eric Dumazet wrote:
>> Le lundi 29 mars 2010 à 13:33 +0200, Michal Simek a écrit :
>>
>>> Do you have any idea howto improve TCP/UDP performance in general?
>>> Or tests which can point me on weak places.
>>
>> Could you post "netstat -s" on your receiver, after fresh boot and your
>> iperf session, for 32 MB and 256 MB ram case ?
>>
> 
> I am not sure if is helpful but look below.
> 
Sorry I forget to c&p that second part. :-(

Look below.
Michal

32MB

~ # cat /proc/meminfo | head -n 1
MemTotal:          30024 kB
~ # iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  6] local 192.168.0.10 port 5001 connected with 192.168.0.101 port 43577
[ ID] Interval       Transfer     Bandwidth
[  6]  0.0-50.0 sec  78.0 MBytes  13.1 Mbits/sec
~ # ./netstat -s
Ip:
     56596 total packets received
     0 forwarded
     0 incoming packets discarded
     56596 incoming packets delivered
     15752 requests sent out
Icmp:
     0 ICMP messages received
     0 input ICMP message failed.
     ICMP input histogram:
     0 ICMP messages sent
     0 ICMP messages failed
     ICMP output histogram:
Tcp:
     0 active connections openings
     1 passive connection openings
     0 failed connection attempts
     0 connection resets received
     0 connections established
     56596 segments received
     15752 segments send out
     0 segments retransmited
     0 bad segments received.
     0 resets sent
Udp:
     0 packets received
     0 packets to unknown port received.
     0 packet receive errors
     0 packets sent
     RcvbufErrors: 0
     SndbufErrors: 0
UdpLite:
     InDatagrams: 0
     NoPorts: 0
     InErrors: 0
     OutDatagrams: 0
     RcvbufErrors: 0
     SndbufErrors: 0
error parsing /proc/net/snmp: Success



256MB


~ # cat /proc/meminfo | head -n 1
MemTotal:         257212 kB
~ # iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  6] local 192.168.0.10 port 5001 connected with 192.168.0.101 port 46069
[ ID] Interval       Transfer     Bandwidth
[  6]  0.0-50.2 sec  19.5 MBytes  3.26 Mbits/sec
~ # ./netstat -s
Ip:
     14163 total packets received
     0 forwarded
     0 incoming packets discarded
     14163 incoming packets delivered
     5209 requests sent out
Icmp:
     0 ICMP messages received
     0 input ICMP message failed.
     ICMP input histogram:
     0 ICMP messages sent
     0 ICMP messages failed
     ICMP output histogram:
Tcp:
     0 active connections openings
     1 passive connection openings
     0 failed connection attempts
     0 connection resets received
     0 connections established
     14163 segments received
     5209 segments send out
     0 segments retransmited
     0 bad segments received.
     0 resets sent
Udp:
     0 packets received
     0 packets to unknown port received.
     0 packet receive errors
     0 packets sent
     RcvbufErrors: 0
     SndbufErrors: 0
UdpLite:
     InDatagrams: 0
     NoPorts: 0
     InErrors: 0
     OutDatagrams: 0
     RcvbufErrors: 0
     SndbufErrors: 0
error parsing /proc/net/snmp: Success



-- 
Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
w: www.petalogix.com p: +61-7-30090663,+42-0-721842854 f: +61-7-30090663
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