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Date: Sun, 22 Aug 2004 08:35:00 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lee Revell <rlrevell@joe-job.com>
Cc: "K.R. Foley" <kr@cybsft.com>, linux-kernel <linux-kernel@vger.kernel.org>,
       Florian Schmidt <mista.tapas@gmx.net>
Subject: Re: [patch] voluntary-preempt-2.6.8.1-P7
Message-ID: <20040822063500.GA20828@elte.hu>
References: <20040816120933.GA4211@elte.hu> <1092716644.876.1.camel@krustophenia.net> <20040817080512.GA1649@elte.hu> <20040819073247.GA1798@elte.hu> <20040820133031.GA13105@elte.hu> <20040820195540.GA31798@elte.hu> <20040821140501.GA4189@elte.hu> <1093125390.817.22.camel@krustophenia.net> <4127E386.5000701@cybsft.com> <1093133810.817.26.camel@krustophenia.net>
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* Lee Revell <rlrevell@joe-job.com> wrote:

> On Sat, 2004-08-21 at 20:06, K.R. Foley wrote:
> > I just posted a similar trace of ~4141 usec from P6 here:
> > 
> > http://www.cybsft.com/testresults/2.6.8.1-P6/latency-trace1.txt
> > 
> 
> This looks wrong:
> 
> 00000003 0.008ms (+0.001ms): dummy_socket_sock_rcv_skb (tcp_v4_rcv)
> 00000004 0.008ms (+0.000ms): tcp_v4_do_rcv (tcp_v4_rcv)
> 00000004 0.009ms (+0.000ms): tcp_rcv_established (tcp_v4_do_rcv)
> 00010004 3.998ms (+3.989ms): do_IRQ (tcp_rcv_established)
> 00010005 3.999ms (+0.000ms): mask_and_ack_8259A (do_IRQ)
> 00010005 4.001ms (+0.002ms): generic_redirect_hardirq (do_IRQ)
> 00010004 4.002ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
> 
> Probably a false positive, Ingo would know better.  What kind of
> stress testing were you doing?

indeed this looks suspect. Is this an SMP system?

	Ingo