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Re: Linux ksoftirq

To: Tharindu Rukshan Bamunuarachchi <tharindu@xxxxxxxxxxx>
Subject: Re: Linux ksoftirq
From: Peter Teoh <htmldeveloper@xxxxxxxxx>
Date: Fri, 26 Jun 2009 08:09:07 +0800
Cc: kernelnewbies@xxxxxxxxxxxx, pradeep singh rautela <rautelap@xxxxxxxxx>
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On Wed, Jun 17, 2009 at 4:40 PM, Tharindu Rukshan
Bamunuarachchi<tharindu@xxxxxxxxxxx> wrote:
> with Oprofile, due to performance hit, we did not see the issue. at
> least we could not pump desired transaction rate.
>
> however, i could find workaround for 100% issue.
>
> i have installed two 1G network cards and used bondding with
> balance-rr (round robin).
>

Yes for 1G I think it is resolvable, but for 10G u may be hitting a
hardware limit...need to do some calculation:

http://seminar.oss.org.tw/fhec/download/Linux%20Multiqueue%20Network%20Driver%20Infrastructure_Herbert%20Xu.pdf

But for 10G, u may need hardware feature like TCP Offload Engine
(Pradeep S Rautela can describe more about that?)

THere is a paper "Performance Characterization of a 10-Gigabit
Ethernet TOE" ....check google.

> now i do not see 100% utilization of ksoftirqd thread.
>
> BTW, i heard -rt patch divide ksoftirqd into two pieces for rx and tx.
> have you guys -rt patch ?
>
>
>



-- 
Regards,
Peter Teoh

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References:
- Linux ksoftirq
  - From: Tharindu Rukshan Bamunuarachchi
- Re: Linux ksoftirq
  - From: Tharindu Rukshan Bamunuarachchi

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