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Re: V2.4 policy router operates faster/better than V2.6

To: netdev@xxxxxxxxxxx
Subject: Re: V2.4 policy router operates faster/better than V2.6
From: "Jeremy M. Guthrie" <jeremy.guthrie@xxxxxxxxxx>
Date: Wed, 12 Jan 2005 16:21:20 -0600
Cc: Robert Olsson <Robert.Olsson@xxxxxxxxxxx>, Stephen Hemminger <shemminger@xxxxxxxx>, Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
In-reply-to: <16869.40556.711969.512311@robur.slu.se>
Organization: Berbee Information Networks
References: <Pine.LNX.4.44.0501071416060.5818-100000@localhost.localdomain> <200501121445.51780.jeremy.guthrie@berbee.com> <16869.40556.711969.512311@robur.slu.se>
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On Wednesday 12 January 2005 04:02 pm, Robert Olsson wrote:
> Jeremy M. Guthrie writes:
>  > My throughput dropped from 500 mbps to 8mbps.  8(
>
>  Weird!
>
>  >            CPU0       CPU1
>  >  18: 3586173518       1815   IO-APIC-level  eth3
>  >  20:          2 2464382507   IO-APIC-level  eth2
>  >
>  >            CPU0       CPU1
>  >  18: 3586173518       1815   IO-APIC-level  eth3
>  >  20:          2 2464387985   IO-APIC-level  eth2
>
>  There are no irq's on eth3 at all so RX softirq is constantly running.
>  Which means it's deferred to ksoftirqd now and running under scheduler
>  context. Do you have anything that competes with ksoftirqd for CPU0 on
>  your system?
This box is primarily routing.  Nothing should be competing for CPU0

>  It used be recommended to increase the priority of ksoftirqd but I wonder
>  what's going on your system. We see interrupts on eth2...
>
>  And tsquz (3:rd col) in /proc/net/sofnet_stat indicates there are very
>  little activity from the RX softirq. It's soon time time up here.
>
>
>       --ro

-- 

--------------------------------------------------
Jeremy M. Guthrie        jeremy.guthrie@xxxxxxxxxx
Senior Network Engineer        Phone: 608-298-1061
Berbee                           Fax: 608-288-3007
5520 Research Park Drive         NOC: 608-298-1102
Madison, WI 53711

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