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

From: Willy Tarreau
Date: Fri Aug 04 2006 - 03:07:59 EST

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@xxxxxxxxxxxxx
> Web: http:\\www.syskonnect.de
>
>
>
> -----Original Message-----
> From: Sean Bruno [mailto:sean.bruno@xxxxxxxxxxxx]
> Sent: Thursday, August 03, 2006 5:40 PM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux@xxxxxxxxxxxxx
> 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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