Mailing List os2-wireless_users@2rosenthals.com Archived Message #6647

From:	"Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com>	Full Headers Undecoded message
Subject:	Re: [OS2Wireless] Nic/router speed drop
Date:	Sun, 28 Feb 2010 21:29:34 -0500
To:	OS/2 Wireless Users Mailing List <os2-wireless_users@2rosenthals.com>

This is becoming a more interesting puzzle... On 02/28/10 08:48 pm, os24u thus wrote : My several month problem of local lan speeds through Linksys router suddenly dropping from 25-30Mbits to 56k modem speed occurred again. Internet side never changed much, LAN could zoom or crawl. Considering the average throughput of WAN connections, it's not uncommon not to notice a drop (unless you are one of 20+ people sharing the same broadband link). BTW, are you running any proxies internally (Squid, etc.) which might account for eating up your LAN bandwidth? When you first suggested the problem, and considering the sudden onset of the symptom, my initial reaction was that the switch in the LinkSys was failing, as they typically do in these little devices. It's rather odd that you've got two boxes behaving similarly. Followed Lewis's advice that Linksys was burning up and replaced with new Dynex. With LInksys today get sometimes crawl speed, other times relatively normal and lockups on ftp transfer on local side. With Dynex get intial faster speeds and almost immediate lockup. Thought occured perhaps nic's were not on same network speed. Auto-sense switches don't normally care. What's more important (usually) is the duplex setting, as sometimes, incompatibilities between switches and clients lead to so much negotiation on the part of the client (full/half), that traffic just bogs. Began modifying .nif files for each card as below. From Accton chip nif: [MEDIA] display = "Physical Medium Type" type = String strlength = 14 ; default = "AUTODETECT" default = "UTP_100" set = AUTODETECT, UTP, UTP_FD, UTP_100,UTP_100FD Haven't the foggiest... Intel and Admtek also set same. Tried full duplex 100 first. Does above look suitable? Is Autodetect better? 4 months ago everything cruised along so something changed. Have you checked/changed your patch cable? On suggestion from this list ran Netio as follows with Accton chip as client. Do these speeds appear normal? Machines with Intel and Accton worked fine in previous months. Admtek recent addition and it could be swapped for other chipset. NETIO - Network Throughput Benchmark, Version 1.26 Intel Pro100 nic TCP connection established. Packet size 1k bytes: 10298 KByte/s Tx, 7621 KByte/s Rx. Packet size 2k bytes: 11414 KByte/s Tx, 7636 KByte/s Rx. Packet size 4k bytes: 11427 KByte/s Tx, 7616 KByte/s Rx. Packet size 8k bytes: 11278 KByte/s Tx, 7624 KByte/s Rx. Packet size 16k bytes: 11268 KByte/s Tx, 7471 KByte/s Rx. Packet size 32k bytes: 11319 KByte/s Tx, 7581 KByte/s Rx. 11427 KB/sec = 91.42Mbps 7624 KB/sec = 60.99Mbps This is not abnormal on a 100Mbps link. Admtek nic TCP connection established. Packet size 1k bytes: 8624 KByte/s Tx, 8091 KByte/s Rx. Packet size 2k bytes: 9819 KByte/s Tx, 8335 KByte/s Rx. Packet size 4k bytes: 10513 KByte/s Tx, 9765 KByte/s Rx. Packet size 8k bytes: 11113 KByte/s Tx, 10024 KByte/s Rx. Packet size 16k bytes: 11158 KByte/s Tx, 9597 KByte/s Rx. Packet size 32k bytes: 11104 KByte/s Tx, 8804 KByte/s Rx. This is similar. (FWIW, you can access a nice bandwidth converter online at http://web.forret.com/tools/bandwidth.asp .) Since switch of router problem changed. One part better, something else worse. Is there a tool to determine what connect speed 2 nics connect at? You just did that. If you want to eliminate the switch, use a crossover cable between the two machines directly. When testing on a switch, make sure that the two machines you want to test are the *only* things connected. Don't rule out the possibility of something else packet storming (intelligent switches can partition off this type of behavior, but these "dumb" ones haven't a clue, so they just pass the traffic). Also, while I freely admit that the other thread concerning DHCP is not *directly* related to wireless networking on OS/2 & eCS, it is at least tangentially related. However, wired networking issues might be better addressed on the eCS Technical list, Cal. Cheers/2 -- Lewis ------------------------------------------------------------- Lewis G Rosenthal, CNA, CLP, CLE Rosenthal & Rosenthal, LLC www.2rosenthals.com Need a managed Wi-Fi hotspot? www.hautspot.com visit my IT blog www.2rosenthals.net/wordpress -------------------------------------------------------------

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