netdev - r8169: slow samba performance

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Date:	Wed, 22 Aug 2007 08:18:38 -0700
From:	Shane <shane@...nu>
To:	netdev@...r.kernel.org
Subject: r8169: slow samba performance

Hello,

Just upgraded a motherboard and it came with an onboard
Realtek card which appears to use the r8169 driver.  The
machine is a samba server and when serving files to a local
Linux or Windows client, I only get approx 40-60 kbps. 
Write performance is fine though, in the tens of mbps and
scp, nfs, and ftp server all work well so it appears
specific to the Samba load.  However, when serving to more
than one client symoltaniously, performance goes up
dramatically, again into the tens of mbps or when there is
other network activity.

I tried switching the lan to an Intel e100 based board and
the problems did not show.  The problem appears to be on
several forums by googling for r8169 samba but I haven't
been able to find a solution as yet.  Some folks have had
luck using the r8168 driver from realtek but that doesn't
seem to compile on latest kernels.

System info:
Intel quad q6600 cpu running arch is x86_64 1gb ram

lspci -vvv:
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI E
xpress Gigabit Ethernet controller (rev 01)
        Subsystem: Giga-byte Technology Unknown device e000
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Step
ping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 1275
        Region 0: I/O ports at c000 [size=256]
        Region 2: Memory at e5000000 (64-bit, non-prefetchable) [size=4K]
        [virtual] Expansion ROM at 40000000 [disabled] [size=128K]
        Capabilities: [40] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-,D1+,D2+,D3h
ot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [48] Vital Product Data
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/1
Enable+
                Address: 00000000fee0f00c  Data: 4191
        Capabilities: [60] Express Endpoint IRQ 0
                Device: Supported: MaxPayload 1024 bytes, PhantFunc 0, ExtTag+
                Device: Latency L0s <128ns, L1 unlimited
                Device: AtnBtn+ AtnInd+ PwrInd+
                Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
                Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                Device: MaxPayload 128 bytes, MaxReadReq 4096 bytes
                Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s, Port 0
                Link: Latency L0s unlimited, L1 unlimited
                Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch-
                Link: Speed 2.5Gb/s, Width x1
        Capabilities: [84] Vendor Specific Information
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [12c] Virtual Channel
        Capabilities: [148] Device Serial Number 68-81-ec-10-00-00-00-00
        Capabilities: [154] Power Budgeting

Shane

-- 
http://www.cm.nu/~shane/
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