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Full Discussion: AIX server problem - network connection is unstable !
Operating Systems AIX AIX server problem - network connection is unstable ! Post 303044690 by Neo on Sunday 1st of March 2020 11:07:34 PM
Old 03-02-2020
Quote:
Originally Posted by bobochacha29
On this ethernet segment we have many servers, but only these two servers got error, so I don't think this's the point.
A slight delay in a packet on a busy Ethernet segment is not "an error". That is how Ethernet works.

What you are "showing us' (an occasional 44 ms delay) is typical of all busy Ethernet segments with many devices.

44 ms is 44 one thousandths of a second. 44/1000 seconds.

The way in which you answer my questions shows you do not understand LAN networking and Ethernet (or networking in general).

Delays on an Ethernet segment are not "errors" and nor is it a sign of "instability". This his how the Ethernet (and indeed most networking protocols work) protocols works (queues, delays, priorities).

If you want guaranteed fast delivery between two hosts, you need to move them to their own Ethernet segment with only two devices on that network.

This is the only approach any experienced network engineer would take or advise.

Think about how Ethernet works. Every device wants to talk at the same time on the same wire. They cannot talk at the same time. The more devices, the more this happens. Each device will wait a random number of milliseconds to transmit when the network is busy. This is now LANs work. The more devices, the more a chance of a delay. So..... a 44ms delay (44/1000 of a second) occasionally on a busy LAN segment is normal.

As I mentioned to you, but you do not seem to want to understand, you want guaranteed fast delivery between two hosts on a LAN segment, you need to move them to their own Ethernet segment with only two devices on that physical networking segment.
 

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LEARN ABOUT NETBSD

ex

EX(4)							   BSD Kernel Interfaces Manual 						     EX(4)

NAME

     ex -- driver for 3Com Fast EtherLink XL (3c900, 3c905, 3c980) and similar PCI bus and cardbus Ethernet interfaces

SYNOPSIS

     ex* at cardbus? function ?
     ex* at pci? dev ? function ?

DESCRIPTION

     3Com Ethernet and Fast Ethernet cards supported by the ex driver include:

     3c450-TX	   10/100 Ethernet
     3c555	   MiniPCI 10/100 Ethernet
     3c575-TX	   Ethernet
     3c575B-TX	   Ethernet
     3c575CT	   Ethernet
     3c656	   MiniPCI 10/100 Ethernet
     3c656B	   MiniPCI 10/100 Ethernet
     3c656C	   MiniPCI 10/100 Ethernet
     3c900-TPO	   Ethernet
     3c900-COMBO   Ethernet
     3c900B-TPC    Ethernet
     3c900B-TPO    Ethernet
     3c900B-COMBO  Ethernet
     3c905-T4	   10/100 Ethernet
     3c905-TX	   10/100 Ethernet
     3c905B-COMBO  10/100 Ethernet
     3c905B-FX	   10/100 Ethernet
     3c905B-T4	   10/100 Ethernet
     3c905B-TX	   10/100 Ethernet
     3c905CX-TX    10/100 Ethernet
     3c980	   Server Adapter 10/100 Ethernet
     3c980C-TXM    10/100 Ethernet
     3cSOHO100-TX  10/100 Ethernet

     All versions of the EtherLink XL (except the older 3c900 and 3c905) support IPv4/TCP/UDP checksumming in hardware.  The ex driver supports
     this feature of the chip.	See ifconfig(8) for information on how to enable this feature.

MEDIA SELECTION

     Some of these network interfaces support the Media Independent Interface (MII), a bus which can have at least one arbitrary Physical inter-
     face (PHY) chip on it.  NetBSD supports MII and has separate drivers for many different PHY chips, including ukphy(4), a generic PHY driver
     that can support many PHY chips that NetBSD does not yet have a specific driver for.

     Support for the PHY found on a given NIC must be configured into a NetBSD kernel config(1) for this driver to work properly in those cases.

     See ifmedia(4), and mii(4).

DIAGNOSTICS

     %s: adapter failure (%x)
     %s: can't allocate download descriptors, error = %d
     %s: can't allocate or map rx buffers
     %s: can't allocate upload descriptors, error = %d
     %s: can't create download desc. DMA map, error = %d
     %s: can't create rx DMA map %d, error = %d
     %s: can't create tx DMA map %d, error = %d
     %s: can't create upload desc. DMA map, error = %d
     %s: can't load download desc. DMA map, error = %d
     %s: can't load mbuf chain, error = %d
     %s: can't load rx buffer, error = %d
     %s: can't load upload desc. DMA map, error = %d
     %s: can't map download descriptors, error = %d
     %s: can't map upload descriptors, error = %d
     %s: fifo underrun (%x) @%d
     %s: jabber (%x)
     %s: receive stalled
     %s: too many segments,
     %s: uplistptr was 0  host too slow to serve incoming packets

SEE ALSO

     cardbus(4), exphy(4), ifmedia(4), intro(4), mii(4), pci(4), ifconfig(8)

     http://www.3com.com/

BSD
								 October 30, 2007							       BSD
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