From: Ingo Molnar <mingo@elte.hu>
To: Mark_H_Johnson@raytheon.com
Cc: Lee Revell <rlrevell@joe-job.com>,
Free Ekanayaka <free@agnula.org>,
Eric St-Laurent <ericstl34@sympatico.ca>,
linux-kernel <linux-kernel@vger.kernel.org>,
"K.R. Foley" <kr@cybsft.com>,
Felipe Alfaro Solana <lkml@felipe-alfaro.com>,
Daniel Schmitt <pnambic@unu.nu>,
"P.O. Gaillard" <pierre-olivier.gaillard@fr.thalesgroup.com>,
nando@ccrma.stanford.edu, luke@audioslack.com, free78@tin.it
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1
Date: Thu, 9 Sep 2004 18:02:03 +0200 [thread overview]
Message-ID: <20040909160203.GA23415@elte.hu> (raw)
In-Reply-To: <OFD3DB738F.105F62D0-ON86256F08.005CDE25-86256F08.005CDE44@raytheon.com>
* Mark_H_Johnson@raytheon.com <Mark_H_Johnson@raytheon.com> wrote:
> Results from this morning's test with -R1 and some follow up on
> related messages.
lt002.v3k1/lt.10 is particularly interesting:
00000001 0.000ms (+0.000ms): spin_lock (rtl8139_poll)
00000001 0.000ms (+0.070ms): spin_lock (<00000000>)
00000001 0.070ms (+0.070ms): rtl8139_rx (rtl8139_poll)
00000001 0.140ms (+0.070ms): alloc_skb (rtl8139_rx)
00000001 0.210ms (+0.070ms): kmem_cache_alloc (alloc_skb)
00000001 0.280ms (+0.073ms): __kmalloc (alloc_skb)
00000001 0.354ms (+0.139ms): eth_type_trans (rtl8139_rx)
00000001 0.493ms (+0.076ms): netif_receive_skb (rtl8139_rx)
00000002 0.570ms (+0.001ms): packet_rcv_spkt (netif_receive_skb)
this too shows the CPU in 'slow motion' in a codepath that normally
executes 10 times faster than this on a 100 MHz Pentium Classic ...
another interesting thing is that the unit of delay seems to be around
70 usecs. As if under certain circumstances every main memory access
created a 70 usecs hit. (a cachemiss perhaps?) The eth_type_trans entry
perhaps generated 2 main memory accesses (2 cachemisses?) or so.
Ingo
next prev parent reply other threads:[~2004-09-09 16:01 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-07 16:54 [patch] voluntary-preempt-2.6.9-rc1-bk4-R1 Mark_H_Johnson
2004-09-08 18:42 ` Ingo Molnar
2004-09-10 2:31 ` K.R. Foley
2004-09-10 17:56 ` K.R. Foley
2004-09-10 19:26 ` Ingo Molnar
2004-09-10 19:28 ` K.R. Foley
2004-09-09 16:02 ` Ingo Molnar [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-09-13 14:44 Mark_H_Johnson
2004-09-14 18:32 ` Ingo Molnar
2004-09-15 15:26 ` Stephen Smalley
2004-09-10 14:28 Mark_H_Johnson
2004-09-10 19:29 ` Ingo Molnar
2004-09-10 12:57 Mark_H_Johnson
2004-09-10 13:10 ` Ingo Molnar
2004-09-09 22:56 Mark_H_Johnson
2004-09-10 12:42 ` Ingo Molnar
2004-09-09 22:41 Mark_H_Johnson
2004-09-09 19:23 Mark_H_Johnson
2004-09-09 19:47 ` Ingo Molnar
2004-09-09 19:02 ` Alan Cox
2004-09-09 18:31 Mark_H_Johnson
2004-09-08 20:33 Mark_H_Johnson
2004-09-08 22:31 ` Alan Cox
2004-09-09 16:44 ` Thomas Charbonnel
2004-09-09 6:27 ` Ingo Molnar
2004-09-09 15:12 ` Ingo Molnar
2004-09-09 15:33 ` Ingo Molnar
2004-09-02 22:14 [patch] voluntary-preempt-2.6.9-rc1-bk4-R0 Ingo Molnar
2004-09-03 0:24 ` Lee Revell
2004-09-03 3:17 ` Eric St-Laurent
2004-09-03 6:26 ` Lee Revell
2004-09-03 6:36 ` Ingo Molnar
2004-09-03 6:49 ` Lee Revell
2004-09-03 7:05 ` Ingo Molnar
2004-09-03 7:40 ` Lee Revell
2004-09-03 7:50 ` Free Ekanayaka
2004-09-03 8:05 ` Lee Revell
2004-09-03 9:25 ` [patch] voluntary-preempt-2.6.9-rc1-bk4-R1 Ingo Molnar
2004-09-03 9:50 ` Luke Yelavich
2004-09-03 10:29 ` Ingo Molnar
2004-09-03 10:43 ` Luke Yelavich
2004-09-03 11:33 ` Thomas Charbonnel
2004-09-03 11:49 ` Ingo Molnar
2004-09-03 12:05 ` Thomas Charbonnel
2004-09-03 16:14 ` Thomas Charbonnel
2004-09-03 17:36 ` Thomas Charbonnel
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