From: <spaminos-ker@yahoo.com>
To: Peter Williams <pwil3058@bigpond.net.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others)
Date: Fri, 27 Aug 2004 18:59:37 -0700 (PDT) [thread overview]
Message-ID: <20040828015937.50607.qmail@web13902.mail.yahoo.com> (raw)
In-Reply-To: <412DA1C3.6020505@bigpond.net.au>
--- Peter Williams <pwil3058@bigpond.net.au> wrote:
> A (gzipped) combined ZAPHOD and P9 voluntary preempt patch for 2.6.8.1
> is available at:
>
>
<http://prdownloads.sourceforge.net/cpuse/patch-2.6.8.1-zaphod-vp-v5.0.1.gz?download>
>
> This patch has had minimal testing so use with care and please let me
> know if there are any problems.
>
I tried this patch, and I get a pretty high latency in "sub_preempt_count"
00000001 0.730ms (+0.730ms): sub_preempt_count (_mmx_memcpy)
I am not sure if that makes sense and what it means.
Nicolas
Here are the full messages:
Aug 27 18:42:11 localhost kernel: (events/0/4): new 730 us maximum-latency
critical section.
Aug 27 18:42:11 localhost kernel: => started at: <kernel_fpu_begin+0x21/0x60>
Aug 27 18:42:11 localhost kernel: => ended at: <_mmx_memcpy+0x131/0x180>
Aug 27 18:42:11 localhost kernel: [<c014106a>]
check_preempt_timing+0x1aa/0x240
Aug 27 18:42:11 localhost kernel: [<c0225751>] _mmx_memcpy+0x131/0x180
Aug 27 18:42:11 localhost kernel: [<c0225751>] _mmx_memcpy+0x131/0x180
Aug 27 18:42:11 localhost kernel: [<c0141244>] sub_preempt_count+0x54/0x60
Aug 27 18:42:11 localhost kernel: [<c0141244>] sub_preempt_count+0x54/0x60
Aug 27 18:42:11 localhost kernel: [<c0225751>] _mmx_memcpy+0x131/0x180
Aug 27 18:42:11 localhost kernel: [<c02dd9fe>] vgacon_save_screen+0x7e/0x80
Aug 27 18:42:11 localhost kernel: [<c0267d32>] do_blank_screen+0x182/0x2b0
Aug 27 18:42:11 localhost kernel: [<c0122fa4>] acquire_console_sem+0x44/0x70
Aug 27 18:42:11 localhost kernel: [<c0266ab2>] console_callback+0x72/0xf0
Aug 27 18:42:11 localhost kernel: [<c0134dcb>] worker_thread+0x1eb/0x2d0
Aug 27 18:42:11 localhost kernel: [<c0266a40>] console_callback+0x0/0xf0
Aug 27 18:42:11 localhost kernel: [<c011c000>] default_wake_function+0x0/0x20
Aug 27 18:42:11 localhost kernel: [<c011c000>] default_wake_function+0x0/0x20
Aug 27 18:42:11 localhost kernel: [<c013963c>] kthread+0xbc/0xd0
Aug 27 18:42:11 localhost kernel: [<c0134be0>] worker_thread+0x0/0x2d0
Aug 27 18:42:11 localhost kernel: [<c0139580>] kthread+0x0/0xd0
Aug 27 18:42:11 localhost kernel: [<c0104389>] kernel_thread_helper+0x5/0xc
preemption latency trace v1.0.2
-------------------------------
latency: 730 us, entries: 4 (4)
-----------------
| task: events/0/4, uid:0 nice:-10 policy:0 rt_prio:0
-----------------
=> started at: kernel_fpu_begin+0x21/0x60
=> ended at: _mmx_memcpy+0x131/0x180
=======>
00000001 0.000ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)
00000001 0.730ms (+0.730ms): sub_preempt_count (_mmx_memcpy)
00000001 0.730ms (+0.000ms): _mmx_memcpy (check_preempt_timing)
00000001 0.730ms (+0.000ms): kernel_fpu_begin (_mmx_memcpy)
next prev parent reply other threads:[~2004-08-28 1:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <411D50AE.5020005@bigpond.net.au>
2004-08-17 23:19 ` Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others) spaminos-ker
2004-08-18 0:12 ` Peter Williams
2004-08-24 21:11 ` spaminos-ker
2004-08-24 23:04 ` Peter Williams
2004-08-24 23:22 ` Lee Revell
2004-08-26 2:30 ` spaminos-ker
2004-08-26 2:42 ` Peter Williams
2004-08-26 8:39 ` Peter Williams
2004-08-28 1:59 ` spaminos-ker [this message]
2004-08-29 0:21 ` Peter Williams
2004-08-29 0:25 ` Lee Revell
2004-08-29 0:45 ` Lee Revell
2004-08-29 2:03 ` Peter Williams
2004-08-29 2:28 ` spaminos-ker
2004-08-29 4:53 ` Peter Williams
2004-08-29 1:19 ` spaminos-ker
2004-08-29 1:22 ` Lee Revell
2004-08-29 1:31 ` Peter Williams
2004-09-13 20:09 ` spaminos-ker
2004-08-29 2:20 ` Lee Revell
[not found] <20040811093945.GA10667@elte.hu>
2004-08-17 23:08 ` spaminos-ker
[not found] <20040811010116.GL11200@holomorphy.com>
2004-08-11 2:21 ` spaminos-ker
2004-08-11 2:23 ` William Lee Irwin III
2004-08-11 2:45 ` Peter Williams
2004-08-11 2:47 ` Peter Williams
2004-08-11 3:23 ` Peter Williams
2004-08-11 3:31 ` Con Kolivas
2004-08-11 3:46 ` Peter Williams
2004-08-11 3:44 ` Peter Williams
2004-08-13 0:13 ` spaminos-ker
2004-08-13 1:44 ` Peter Williams
2004-08-11 3:09 ` Con Kolivas
2004-08-11 10:24 ` Prakash K. Cheemplavam
2004-08-12 2:04 ` spaminos-ker
2004-08-12 2:24 ` spaminos-ker
2004-08-12 2:53 ` Con Kolivas
2004-08-07 21:53 spaminos-ker
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20040828015937.50607.qmail@web13902.mail.yahoo.com \
--to=spaminos-ker@yahoo.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pwil3058@bigpond.net.au \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.