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Thread: Gigabit network is slow

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  1. #1
    Join Date
    Mar 2007

    Question Gigabit network is slow

    Hi all.
    I have a problem with my gigabit-LAN. The setup looks like this:
    Internet - ClearOS Firewall - Gigabit-switch - clients.

    Computer #1 (desktop):
    3.4 GHz quadcore, 4GB RAM, onboard LAN (gigabit).
    Primary OS: Ubuntu 12.04
    Secondary OS: Windows 7

    Computer #2 (Windows 2008r2 Server):
    3.5 GHz quadcore, 16GB RAM, onboard LAN (gigabit).

    The problem is that I can not achive full speed with Ubuntu > Win Server. Maximum speed that I've seen while transfering files is ~25-26MB/s, while Win7 > Win server gives me around 90-110MB/s. So, there's no hardware problem.

    From Win Server > Ubuntu desktop the speed is about ~35MB/s.

    I have tried with another NIC from Intel (PCI-E gigabit), and got the same poor performance. So what could be the problem here? I've installed the latest drivers for my onboard NIC, without any changes...

    Some outputs:
    ethtool eth0:
    Settings for eth0:
    	Supported ports: [ TP ]
    	Supported link modes:   10baseT/Half 10baseT/Full 
    	                        100baseT/Half 100baseT/Full 
    	Supported pause frame use: No
    	Supports auto-negotiation: Yes
    	Advertised link modes:  10baseT/Half 10baseT/Full 
    	                        100baseT/Half 100baseT/Full 
    	Advertised pause frame use: Symmetric Receive-only
    	Advertised auto-negotiation: Yes
    	Speed: 1000Mb/s
    	Duplex: Full
    	Port: Twisted Pair
    	PHYAD: 0
    	Transceiver: internal
    	Auto-negotiation: on
    	MDI-X: Unknown
    	Supports Wake-on: pumbg
    	Wake-on: g
    	Current message level: 0x00000033 (51)
    			       drv probe ifdown ifup
    	Link detected: yes
    sudo lcpci -v:
    05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
    	Subsystem: ASUSTeK Computer Inc. P8P67 and other motherboards
    	Flags: bus master, fast devsel, latency 0, IRQ 49
    	I/O ports at e800 [size=256]
    	Memory at fafff000 (64-bit, prefetchable) [size=4K]
    	Memory at faff8000 (64-bit, prefetchable) [size=16K]
    	Capabilities: [40] Power Management version 3
    	Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
    	Capabilities: [70] Express Endpoint, MSI 01
    	Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
    	Capabilities: [d0] Vital Product Data
    	Capabilities: [100] Advanced Error Reporting
    	Capabilities: [140] Virtual Channel
    	Capabilities: [160] Device Serial Number *************
    	Kernel driver in use: r8168
    	Kernel modules: r8168
    What could be the problem?
    Last edited by ericus; October 29th, 2012 at 03:17 PM.

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