netdev - Re: [Bugme-new] [Bug 11752] New: Extremely low netperf UDP

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Message-Id: <20081016134920.1492cdcc.akpm@linux-foundation.org>
Date:	Thu, 16 Oct 2008 13:49:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	bugme-daemon@...zilla.kernel.org, arno@...o.snv.jussieu.fr,
	Ayaz Abdulla <aabdulla@...dia.com>
Subject: Re: [Bugme-new] [Bug 11752] New: Extremely low netperf UDP_RR
 throughput for nvidia MCP65


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Mon, 13 Oct 2008 13:41:19 -0700 (PDT)
bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=11752
> 
>            Summary: Extremely low netperf UDP_RR throughput for nvidia MCP65
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: from F10-Beta-x86_64-Live-KDE.iso
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: jgarzik@...ox.com
>         ReportedBy: arno@...o.snv.jussieu.fr
> 
> 
> Latest working kernel version: -
> Earliest failing kernel version:
> Distribution: F10-Beta-x86_64
> Hardware Environment: HP Pavillon dv6820ef
> Software Environment:
> Problem Description: when running at 1Gbps netperf shows good performance for
> TCP_STREAM and UDP_STREAM tests, but extremely bad performance for UDP_RR test
> (less then 1 ping-pong a second whereas at 100Mbps performance easily reaches
> 10-20K a second)
> 
> A friend figured out that it looks like small packets at 1Gbps are dropped
> as being falsely considered crc-errored.
> 
> 
> 
> Steps to reproduce:

Which driver is this using?  forcedeth?
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