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Old 06-14-2006, 11:10 PM   #1
Registered: Aug 2003
Posts: 54

Rep: Reputation: 15
Tigon3 network card fast on receive, slow on send

I have a machine in a customers datacenter.
My machine is a Dual 3.2Ghz Xeon running Suse 10.0. (More details below).

My problem is that network activity into the box (e.g. an ftp get) is very fast (ftp reports 192.80 MB/s).
However network activity out of the box (e.g. an ftp put) is slow (ftp reports between 5 and 15 KB/s).

Could it be the half duplex? Is this a problem on this machine or with what the device is connected to (Sorry - I haven't been to the datacenter myself - it's in a different country, so I don't know what it's connected to).

Following is some machine info....

# dmesg | grep eth0 gives,

342:eth0: Tigon3 [partno(N/A) rev 1100 PHY(5703)] (PCIX:100MHz:64-bit) 10/100/1000BaseT Ethernet 00:14:c2:60:27:21
343:eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] Split[0] WireSpeed[1] TSOcap[0]
344:eth0: dma_rwctrl[769f4000]
355:tg3: eth0: Link is up at 100 Mbps, half duplex.
356:tg3: eth0: Flow control is off for TX and off for RX.
367:eth0: no IPv6 routers present

# uname -a gives,
Linux au105 2.6.13-15-bigsmp #1 SMP Tue Sep 13 14:56:15 UTC 2005 i686 i686 i386 GNU/Linux

# ifconfig gives,
eth0 Link encap:Ethernet HWaddr 00:14:C2:60:27:21
inet addr: Bcast: Mask:
inet6 addr: fe80::214:c2ff:fe60:2721/64 Scope:Link
RX packets:11201226 errors:0 dropped:0 overruns:0 frame:0
TX packets:5492896 errors:92 dropped:0 overruns:0 carrier:0
collisions:2859635 txqueuelen:1000
RX bytes:3482209282 (3320.8 Mb) TX bytes:2145988770 (2046.5 Mb)

lo Link encap:Local Loopback
inet addr: Mask:
inet6 addr: ::1/128 Scope:Host
RX packets:11600718 errors:0 dropped:0 overruns:0 frame:0
TX packets:11600718 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:305399509 (291.2 Mb) TX bytes:305399509 (291.2 Mb)

I look forward to a response,
Old 06-15-2006, 07:37 AM   #2
Registered: Apr 2005
Location: chained to my console.
Distribution: LFS 6.1
Posts: 143

Rep: Reputation: 18
ok, silly question time.

are you ftp'ing from your home machine to the server? and if so, what is your home connection? are you using domestic cable/dsl, by any chance?

many domestic cable lines have a high downstream speed, and a comparatively small upstream speed. for example, my dsl achieves ~240K/s down, and only ~25K/s up. if you are connecting from your home machine to your remote server, it doesn't matter how fast the server can transport data, the bottleneck exists in your home connection.
Old 06-15-2006, 02:16 PM   #3
Registered: Aug 2003
Posts: 54

Original Poster
Rep: Reputation: 15
No, nothing to do with home at all. This machine is sitting in a corporate datacenter (not managed or physically accessible by myself as it's in a different country).
However, I have ssh access to the box. I am trying to ftp to another machine in the datacenter.
I don't know whether it's just ftp, but unfortunately I have limited access and ftp seems the only way to measure network performance.

On this box, I am running a sophisticated factory rollstock simulation application. This application is frequently copying files across the network.
We noticed the performance problem when this application started.

My concerns are,
Is it a driver issue?
Is it a half duplex issue - and if so, is it half duplex because it is connected to equipment that is forcing half duplex?



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