netdev - Re: HTB accuracy for high speed

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Message-Id: <1242688479.9558.60.camel@hazard2.francoudi.com>
Date:	Tue, 19 May 2009 02:14:39 +0300
From:	Vladimir Ivashchenko <hazard@...ncoudi.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	netdev@...r.kernel.org, kaber@...sh.net, davem@...emloft.net,
	devik@....cz, Antonio Almeida <vexwek@...il.com>
Subject: Re: HTB accuracy for high speed

On Mon, 2009-05-18 at 15:36 +0100, Antonio Almeida wrote:
> This patch works perfectly!
> rate (bits/s) is now decreasing along with pps when I stop the traffic
> (doesn't grow as it used to for rates over 500Mbtis/s).

I'm not able to reach full speed with bond + HTB + sfq on 2.6.29.1, both
with and without these patches. I seem to get a lot of drops on sfq
qdiscs, whatever quantum I set. Playing with IRQ affinity doesn't help.
I didn't check without bond.

With bond + HFSC + sfq, I'm able to reach the speed. It doesn't seem to
overspill with 580 mbps load. Jarek, would your patches help with HSFC
overspill ? I will check tomorrow under 750 mbps load. 

# ethtool -k eth0
Offload parameters for eth0:
Cannot get device flags: Operation not supported
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off
large receive offload: off

# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc

-- 
Best Regards,
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel PLC, Cyprus - www.prime-tel.com
Tel: +357 25 100100 Fax: +357 2210 2211


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