linux-kernel - Re: sk98lin extremely slow transfer rate ASUS P5P800(2.6.17.7)

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Message-ID: <20060804070019.GC8776@1wt.eu>
Date:	Fri, 4 Aug 2006 09:00:19 +0200
From:	Willy Tarreau <w@....eu>
To:	SysKonnect Support <support@...konnect.de>
Cc:	Sean Bruno <sean.bruno@...-only.net>, linux-kernel@...r.kernel.org,
	linux@...konnect.de
Subject: Re: sk98lin extremely slow transfer rate ASUS P5P800(2.6.17.7)

Hi,

On Fri, Aug 04, 2006 at 08:50:33AM +0200, SysKonnect Support wrote:
> Hi Sean,
> 
> Did you test with the current driver version 8.34, which is vailable on
> our website?

I've already observed the same behaviour (8.31 though). The problem was that
after sending a few thousands UDP packets, then next UDP packets would not
go out without some TCP traffic to "push" them outside. This is a real problem
on NFS (where I first noticed it). But for me, it happened only on Yukon
cards and not on Yukon2.

Hoping this helps,
Willy


> Best regards,
> Karim
>
> Marvell(r) Semiconductor Germany GmbH 
> ------------------------------------- 
> Karim Jamal 
> Technical Support Engineer 
> -------------------------------------- 
> Phone: +49 (0) 7243502-330 
> Fax: +49 (0) 7243502-364 
> Mail: support@...konnect.de 
> Web: http:\\www.syskonnect.de 
> 
> 
> 
> -----Original Message-----
> From: Sean Bruno [mailto:sean.bruno@...-only.net] 
> Sent: Thursday, August 03, 2006 5:40 PM
> To: linux-kernel@...r.kernel.org
> Cc: linux@...konnect.de
> Subject: sk98lin extremely slow transfer rate ASUS P5P800(2.6.17.7)
> 
> 
> I am experiencing a very slow(32Kbytes per second) transfer rate on an
> ASUS P5P800 mobo.  This occurs on a special case where I am sending
> individual 32Kbyte messages from a second server.  
> 
> I suspect the hardware, but am not sure how to come up with a 'good'
> regression test for this issue.  
> 
> Configurations I have tried:
> 
> 1. If I swap out the ethernet adapter(tried a intel 10/100 and intel
> 10/100/1000) the transfer rate jumps up into the MBytes / second.
> 
> 2. If I do 'other' network activity on the box, like scp'ing' files
> around, the transfer rate for my 32Kbyte packets goes up into the Mbytes
> / second.  So I am a little baffled with the behavior.  
> 
> 3. If I just 'scp' files around of various sizes the transfer rate goes
> up into the Mbytes / second.
> 
> 
> 
> some of the relevant dmesg information:
> 
> eth0: Yukon Gigabit Ethernet 10/100/1000Base-T Adapter
>       PrefPort:A  RlmtMode:Check Link State
> ...
> eth0: network connection up using port A
>     speed:           1000
>     autonegotiation: yes
>     duplex mode:     full
>     flowctrl:        symmetric
>     role:            slave
>     irq moderation:  disabled
>     scatter-gather:  disabled
>     tx-checksum:     disabled
>     rx-checksum:     disabled
> 
> 
> lspci -vvv output for the ethernet adapter:
> 02:05.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001
> Gigabit Ethernet Controller (rev 13)
>         Subsystem: ASUSTeK Computer Inc. Marvell 88E8001 Gigabit
> Ethernet Controller (Asus)
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
> ParErr- Stepping- SERR+ FastB2B-
>         Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 64 (5750ns min, 7750ns max), Cache Line Size 04
>         Interrupt: pin A routed to IRQ 7
>         Region 0: Memory at fbffc000 (32-bit, non-prefetchable)
> [size=16K]
>         Region 1: I/O ports at e800 [size=256]
>         Expansion ROM at f0000000 [disabled] [size=128K]
>         Capabilities: [48] Power Management version 2
>                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1
> +,D2+,D3hot+,D3cold+)
>                 Status: D0 PME-Enable- DSel=0 DScale=1 PME-
>         Capabilities: [50] Vital Product Data
> 
> The Marvel ethernet adapter is connected to a Linksys SD2005 10/100/1000
> switch.  
> 
> Any ideas why it would be doing this or a 'good' test for me to try?
> 
> Sean
> 
> -
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