Re: Network performance - iperf

From: Michal Simek
Date: Tue Mar 30 2010 - 05:34:44 EST

This is a multi-part message in MIME format.Eric Dumazet wrote:
Le lundi 29 mars 2010 Ã 17:27 +0200, Michal Simek a Ãcrit :
Michal Simek wrote:
Eric Dumazet wrote:
Le lundi 29 mars 2010 Ã 13:33 +0200, Michal Simek a Ãcrit :

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. :-(


Sorry, your netstat is not up2date.

I am afraid that is up2date.


If you cannot correct it to last version
[ net-tools 1.60 , netstat 1.42 ], please send

cat /proc/net/snmp
cat /proc/net/netstat

There is small buffer for parsing /proc/net/netstat.
There is necessary to extend buffer size because one line is greater than 1024 chars.

~ # head -n 1 /proc/net/netstat
TcpExt: SyncookiesSent SyncookiesRecv SyncookiesFailed EmbryonicRsts PruneCalled RcvPruned OfoPruned OutOfWindowIcmps LockDroppedIcmps ArpFilter TW TWRecycled TWKilled PAWSPassive PAWSActive PAWSEstab DelayedACKs DelayedACKLocked DelayedACKLost ListenOverflows ListenDrops TCPPrequeued TCPDirectCopyFromBacklog TCPDirectCopyFromPrequeue TCPPrequeueDropped TCPHPHits TCPHPHitsToUser TCPPureAcks TCPHPAcks TCPRenoRecovery TCPSackRecovery TCPSACKReneging TCPFACKReorder TCPSACKReorder TCPRenoReorder TCPTSReorder TCPFullUndo TCPPartialUndo TCPDSACKUndo TCPLossUndo TCPLoss TCPLostRetransmit TCPRenoFailures TCPSackFailures TCPLossFailures TCPFastRetrans TCPForwardRetrans TCPSlowStartRetrans TCPTimeouts TCPRenoRecoveryFail TCPSackRecoveryFail TCPSchedulerFailed TCPRcvCollapsed TCPDSACKOldSent TCPDSACKOfoSent TCPDSACKRecv TCPDSACKOfoRecv TCPAbortOnSyn TCPAbortOnData TCPAbortOnClose TCPAbortOnMemory TCPAbortOnTimeout TCPAbortOnLinger TCPAbortFailed TCPMemoryPressures TCPSACKDiscard TCPDSACKIgnoredOld TCPDSACKIgnoredNoUndo TCPSpuriousRTOs TCPMD5NotFound TCPMD5Unexpected TCPSackShifted TCPSackMerged TCPSackShiftFallback TCPBacklogDrop TCPMinTTLDrop

Look at attached patch.
And updated results are below.

Thanks,
Michal





256M

~ # 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 33261
[ ID] Interval Transfer Bandwidth
[ 6] 0.0-50.2 sec 22.9 MBytes 3.83 Mbits/sec
~ # ./netstat -s
Ip:
16618 total packets received
0 forwarded
0 incoming packets discarded
16618 incoming packets delivered
6490 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
16618 segments received
6490 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
TcpExt:
2233 packets pruned from receive queue because of socket buffer overrun
ArpFilter: 0
1 delayed acks sent
5519 packets header predicted
TCPPureAcks: 2
TCPHPAcks: 0
TCPRenoRecovery: 0
TCPSackRecovery: 0
TCPSACKReneging: 0
TCPFACKReorder: 0
TCPSACKReorder: 0
TCPRenoReorder: 0
TCPTSReorder: 0
TCPFullUndo: 0
TCPPartialUndo: 0
TCPDSACKUndo: 0
TCPLossUndo: 0
TCPLoss: 0
TCPLostRetransmit: 0
TCPRenoFailures: 0
TCPSackFailures: 0
TCPLossFailures: 0
TCPFastRetrans: 0
TCPForwardRetrans: 0
TCPSlowStartRetrans: 0
TCPTimeouts: 0
TCPRenoRecoveryFail: 0
TCPSackRecoveryFail: 0
TCPSchedulerFailed: 0
TCPRcvCollapsed: 207654
TCPDSACKOldSent: 0
TCPDSACKOfoSent: 0
TCPDSACKRecv: 0
TCPDSACKOfoRecv: 0
TCPAbortOnSyn: 0
TCPAbortOnData: 0
TCPAbortOnClose: 0
TCPAbortOnMemory: 0
TCPAbortOnTimeout: 0
TCPAbortOnLinger: 0
TCPAbortFailed: 0
TCPMemoryPressures: 0
TCPSACKDiscard: 0
TCPDSACKIgnoredOld: 0
TCPDSACKIgnoredNoUndo: 0
TCPSpuriousRTOs: 0
TCPMD5NotFound: 0
TCPMD5Unexpected: 0
TCPSackShifted: 0
TCPSackMerged: 0
TCPSackShiftFallback: 0
TCPBacklogDrop: 0
TCPMinTTLDrop: 0
IpExt:
InNoRoutes: 0
InTruncatedPkts: 0
InMcastPkts: 0
OutMcastPkts: 0
InBcastPkts: 0
OutBcastPkts: 0
InOctets: 24915880
OutOctets: 337488
InMcastOctets: 0
OutMcastOctets: 0
InBcastOctets: 0
OutBcastOctets: 0
~ # ./netstat --version
net-tools 1.60
netstat 1.42 (2001-04-15)
Fred Baumgarten, Alan Cox, Bernd Eckenfels, Phil Blundell, Tuan Hoang and others
+NEW_ADDRT +RTF_IRTT +RTF_REJECT +FW_MASQUERADE -I18N
AF: (inet) +UNIX +INET -INET6 -IPX -AX25 -NETROM -X25 -ATALK -ECONET -ROSE
HW: +ETHER -ARC +SLIP +PPP -TUNNEL -TR -AX25 -NETROM -X25 -FR -ROSE -ASH -SIT -FDDI -HIPPI -HDLC/LAPB
~ # head -n 1 /proc/meminfo
MemTotal: 257108 kB



32MB

~ # head -n 1 /proc/meminfo
MemTotal: 29920 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 50088
[ ID] Interval Transfer Bandwidth
[ 6] 0.0-50.0 sec 109 MBytes 18.3 Mbits/sec
~ # ./netstat -s
Ip:
79040 total packets received
0 forwarded
0 incoming packets discarded
79040 incoming packets delivered
29655 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
79040 segments received
29655 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
TcpExt:
9773 packets pruned from receive queue because of socket buffer overrun
ArpFilter: 0
1 delayed acks sent
101 packets directly queued to recvmsg prequeue.
558928 packets directly received from prequeue
33274 packets header predicted
378 packets header predicted and directly queued to user
TCPPureAcks: 2
TCPHPAcks: 0
TCPRenoRecovery: 0
TCPSackRecovery: 0
TCPSACKReneging: 0
TCPFACKReorder: 0
TCPSACKReorder: 0
TCPRenoReorder: 0
TCPTSReorder: 0
TCPFullUndo: 0
TCPPartialUndo: 0
TCPDSACKUndo: 0
TCPLossUndo: 0
TCPLoss: 0
TCPLostRetransmit: 0
TCPRenoFailures: 0
TCPSackFailures: 0
TCPLossFailures: 0
TCPFastRetrans: 0
TCPForwardRetrans: 0
TCPSlowStartRetrans: 0
TCPTimeouts: 0
TCPRenoRecoveryFail: 0
TCPSackRecoveryFail: 0
TCPSchedulerFailed: 0
TCPRcvCollapsed: 120195
TCPDSACKOldSent: 0
TCPDSACKOfoSent: 0
TCPDSACKRecv: 0
TCPDSACKOfoRecv: 0
TCPAbortOnSyn: 0
TCPAbortOnData: 0
TCPAbortOnClose: 0
TCPAbortOnMemory: 0
TCPAbortOnTimeout: 0
TCPAbortOnLinger: 0
TCPAbortFailed: 0
TCPMemoryPressures: 0
TCPSACKDiscard: 0
TCPDSACKIgnoredOld: 0
TCPDSACKIgnoredNoUndo: 0
TCPSpuriousRTOs: 0
TCPMD5NotFound: 0
TCPMD5Unexpected: 0
TCPSackShifted: 0
TCPSackMerged: 0
TCPSackShiftFallback: 0
TCPBacklogDrop: 0
TCPMinTTLDrop: 0
IpExt:
InNoRoutes: 0
InTruncatedPkts: 0
InMcastPkts: 0
OutMcastPkts: 0
InBcastPkts: 0
OutBcastPkts: 0
InOctets: 118232864
OutOctets: 1542068
InMcastOctets: 0
OutMcastOctets: 0
InBcastOctets: 0
OutBcastOctets: 0
~ #










--
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