One Way Network Performance Problem

One Way Network Performance Problem

Post by Harry Hinder » Fri, 26 Mar 1999 04:00:00

Hi everybody,

we have a serious problem with the network performance on our RS/6000-
550. The connection to the network works fine and the transmit speed
about 800 kB/s. But the receive data transfer runs only with 8 kB/s.
workstation has a 10MBit ethernet card working in half duplex mode. It
connected to the network over a switch and a AUI/RJ45 transceiver. The

output of the command 'entstat -d ent0' is the following:

Device Type: Ethernet High Performance LAN Adapter
Hardware Address: 02:60:8c:2e:0e:f7
Elapsed Time: 1 days 20 hours 31 minutes 58 seconds

Transmit Statistics:                          Receive Statistics:
--------------------                          -------------------
Packets: 38059                                Packets: 38658
Bytes: 34391451                               Bytes: 31174627
Interrupts: 38064                             Interrupts: 38657
Transmit Errors: 5                            Receive Errors: 0
Packets Dropped: 0                            Packets Dropped: 0
                                              Bad Packets: 0
Max Packets on S/W Transmit Queue: 0        
S/W Transmit Queue Overflow: 0
Current S/W+H/W Transmit Queue Length: 0

Broadcast Packets: 8                          Broadcast Packets: 10206
Multicast Packets: 2                          Multicast Packets: 0
No Carrier Sense: 253                         CRC Errors: 0
DMA Underrun: 3                               DMA Overrun: 0
Lost CTS Errors: 0                            Alignment Errors: 0
Max Collision Errors: 0                       No Resource Errors: 0
Late Collision Errors: 0                      Receive Collision
Errors: 0
Deferred: 0                                   Packet Too Short Errors:
SQE Test: 0                                   Packet Too Long Errors:
Timeout Errors: 0                             Packets Discarded by
Adapter: 0
Single Collision Count: 0                     Receiver Start Count: 1
Multiple Collision Count: 0
Current HW Transmit Queue Length: 0

General Statistics:
No mbuf Errors: 0
Adapter Reset Count: 0
Driver Flags: Up Broadcast Running
        Simplex AlternateAddress 64BitSupport

Ethernet High Performance LAN Adapter Specific Statistics:
Receive Buffer Pool Size: 37
Transmit Buffer Pool Size: 39
In Promiscuous Mode for IP Multicast: No
Packets Uploaded from Adapter: 0
Host End-of-List Encountered: 0
82586 End-of-List Encountered: 0
Receive DMA Timeouts: 0
Adapter Internal Data: 0x0 0x0 0x0 0x0 0x0

Have anybody an idea why the receive data speed is so slow ?

Thanks for your help,

Harry Hinderer


1. Ways to quickly check for network problems?

Is there some sort of simple way to check if the network is behaving
correctly, other than ping, ping doesn't cut it.  I've sometimes
experienced a strange situation where if I rlogin into machines that I
normally can without any password, suddenly I have to entire a password,
and then the system seems to be missing lots of commands.

Then there was a situation where I tried to access a file that I can
normally access any time, but I was getting a message saying the file
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I was trying to think of a simple way to test if something strange is
happening with the network, this could be useful to some scripts I have
running.  One idea is to create a test file on in the directory I will
be using and occasionally try to cat the file to see if the file can be

thanks for any ideas.

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