linux-kernel - Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080522171531.GZ28241@solarflare.com>
Date:	Thu, 22 May 2008 18:15:33 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jesper Krogh <jesper@...gh.cc>
Cc:	David Miller <davem@...emloft.net>, Matheos.Worku@....COM,
	yhlu.kernel@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

Jesper Krogh wrote:
> David Miller wrote:
> >From: Matheos Worku <Matheos.Worku@....COM>
> >Date: Fri, 09 May 2008 15:36:17 -0700
> >
> >>I have observed TX throughput degradation (and increased CPU 
> >>utilization)  occurs with increased # of connections, when CPU count > 4 
> >>CPUs.  I don't think it is related to the driver (or HW).
> >
> >All transmits through a device are fully serialized currently,
> >it's a known problem and something we plan to fix.
> 
> I google'd up this one:
> 
> http://vger.kernel.org/~davem/davem_tokyo08.pdf (slide 23+).
> 
> Does this mean that I can expect every 10G card to have this limitation
> under Linux? Or are some known to be better than others?
> (I can probably justify paying for another 10G card if I can expect to
> gain the last 400MB/s).
[...]

Our controller and driver can reach line rate for a single TCP/IPv4 stream,
depending on the host system.  I don't think we're alone in that, though
there are few published benchmarks that don't involve TOEs.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/