Deferred tranmit, Optimising network.

[amakitalo]

Hi!

there is some slowdown in network.

It takes 11 minutes to copy 524Mb file.
Gigabit ethernet (and 100Mb).

What should be done?

There is some collisions also.
Here is report made by netstats -s
IP Statistics

Packets Received = 333096567
Received Header Errors = 0
Received Address Errors = 428557
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 332663310
Output Requests = 597568431
Routing Discards = 0
Discarded Output Packets = 0
Output Packet No Route = 0
Reassembly Required = 2
Reassembly Successful = 1
Reassembly Failures = 0
Datagrams Successfully Fragmented = 1
Datagrams Failing Fragmentation = 0
Fragments Created = 2

ICMP Statistics

Received Sent
Messages 4658 4677
Errors 0 0
Destination Unreachable 0 3
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenches 0 0
Redirects 0 0
Echos 853 3821
Echo Replies 3805 853
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0

TCP Statistics

Active Opens = 852544
Passive Opens = 866207
Failed Connection Attempts = 598
Reset Connections = 3524
Current Connections = 153
Segments Received = 326587472
Segments Sent = 595652872
Segments Retransmitted = 106965

UDP Statistics

Datagrams Received = 5848696
No Ports = 235896
Receive Errors = 0
Datagrams Sent = 1812187

 

[amakitalo]

Well, copying Gbit to Gbit takes 65 sec with 524Mb
wisch look better (64Mbits/s).

But there are some deferred- and re-transmits.
Can somebody say opinions about those?

IP Statistics

Packets Received = 333593077
Received Header Errors = 0
Received Address Errors = 429703
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 333158677
Output Requests = 598342618
Routing Discards = 0
Discarded Output Packets = 0
Output Packet No Route = 0
Reassembly Required = 2
Reassembly Successful = 1
Reassembly Failures = 0
Datagrams Successfully Fragmented = 1
Datagrams Failing Fragmentation = 0
Fragments Created = 2

ICMP Statistics

Received Sent
Messages 4672 4691
Errors 0 0
Destination Unreachable 0 3
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenches 0 0
Redirects 0 0
Echos 855 3833
Echo Replies 3817 855
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0

TCP Statistics

Active Opens = 854632
Passive Opens = 868431
Failed Connection Attempts = 600
Reset Connections = 3533
Current Connections = 153
Segments Received = 327062483
Segments Sent = 596418295
Segments Retransmitted = 107059

UDP Statistics

Datagrams Received = 5868460
No Ports = 236473
Receive Errors = 0
Datagrams Sent = 1820807

 

[bcastner]

Examine the issues discussed in this MS KB:

http://support.microsoft.com/?kbid=315237

 

[amakitalo]

Surely that microsoft trick will fix counters but
does throuhput get any better.

Is it normal that some Retransmitit and Deferred transmit
happens? Or is it really a matter which must be handled?

 

[bcastner]

I believe you misunderstood the heart of the article. It was to reduce retransmissions due to collisions. It was not a counter accuracy piece.