From: Andrew Morton <andrewm@uow.edu.au>
To: Gregory Maxwell <greg@linuxpower.cx>
Cc: lkml <linux-kernel@vger.kernel.org>,
lad <linux-audio-dev@ginette.musique.umontreal.ca>
Subject: Re: low-latency scheduling patch for 2.4.0
Date: Mon, 15 Jan 2001 21:59:59 +1100 [thread overview]
Message-ID: <3A62D82F.49BF3693@uow.edu.au> (raw)
In-Reply-To: <3A57DA3E.6AB70887@uow.edu.au> <3A618F17.FD285E2B@uow.edu.au>, <3A618F17.FD285E2B@uow.edu.au>; from andrewm@uow.edu.au on Sun, Jan 14, 2001 at 10:35:51PM +1100 <20010114093836.C10910@xi.linuxpower.cx>
Gregory Maxwell wrote:
>
> On Sun, Jan 14, 2001 at 10:35:51PM +1100, Andrew Morton wrote:
> [snip]
> > - The patch now works properly on SMP.
> [snip]
>
> Any benchmark results on SMP yet?
SMP and UP are much the same.
Workload is `make -j3 bzImage', the measured time
is from entry to an ISR to execution of the userspace
process. The histogram has 10 microsecond resolution.
SMP
===
0:165601 10:17192 20:12769 30:33220 40:59318
50:60814 60:42915 70:20949 80:8124 90:2590
100:944 110:397 120:211 130:96 140:51
150:41 160:36 170:24 180:21 190:15
200:14 210:12 220:13 230:7 240:11
250:6 260:3 270:4 280:10 290:6
300:5 310:3 320:3 330:6 340:1
350:1 370:1 400:1 620:1
Total samples: 425436
So on SMP, latency is < 10 microseconds 165601/425436 = 39% of
the time.
UP
==
0:52735 10:33480 20:101199 30:200301 40:135470
50:9199 60:4356 70:1531 80:770 90:396
100:288 110:178 120:102 130:100 140:63
150:45 160:61 170:40 180:30 190:23
200:29 210:12 220:26 230:10 240:8
250:6 260:2 300:1
Total samples: 540461
In other words:
SMP
===
usecs
0 -100: 99.54%
100-200: 0.43%
200-300: 0.02%
300-400: 0.0049%
620: 0.00023%
UP
==
0 -100: 99.81%
100-200: 0.17%
200-300: 0.017%
-
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prev parent reply other threads:[~2001-01-15 10:54 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-07 2:53 low-latency scheduling patch for 2.4.0 Andrew Morton
2001-01-11 3:12 ` [linux-audio-dev] " Jay Ts
2001-01-11 3:22 ` Cort Dougan
2001-01-11 12:38 ` Alan Cox
2001-01-11 11:30 ` Andrew Morton
2001-01-11 5:19 ` David S. Miller
2001-01-11 13:57 ` Daniel Phillips
2001-01-11 20:55 ` Nigel Gamble
2001-01-11 21:31 ` David S. Miller
2001-01-15 5:27 ` george anzinger
2001-01-12 13:30 ` Andrew Morton
2001-01-12 15:11 ` Tim Wright
2001-01-12 22:30 ` Nigel Gamble
2001-01-13 1:01 ` Andrew Morton
2001-01-15 19:46 ` Tim Wright
2001-01-12 22:46 ` Nigel Gamble
2001-01-12 23:08 ` george anzinger
2001-01-21 0:05 ` yodaiken
2001-01-22 0:54 ` Nigel Gamble
2001-01-22 1:49 ` Paul Barton-Davis
2001-01-22 2:21 ` Nigel Gamble
2001-01-22 3:31 ` J Sloan
2001-01-28 13:14 ` yodaiken
2001-01-28 14:07 ` Bill Huey
2001-01-28 14:26 ` Andrew Morton
2001-01-29 5:02 ` yodaiken
2001-01-28 14:19 ` Andrew Morton
2001-01-28 16:17 ` Joe deBlaquiere
2001-01-29 15:44 ` yodaiken
2001-01-29 17:23 ` Joe deBlaquiere
2001-01-29 17:38 ` yodaiken
2001-01-29 18:03 ` Joe deBlaquiere
2001-01-30 15:08 ` David Woodhouse
2001-01-30 15:44 ` Joe deBlaquiere
2001-01-30 16:29 ` Paul Davis
2001-01-30 16:35 ` David Woodhouse
2001-01-31 7:55 ` george anzinger
2001-01-30 16:19 ` David Woodhouse
2001-02-01 12:40 ` Pavel Machek
2001-02-01 22:33 ` David Woodhouse
2001-02-02 4:17 ` Joe deBlaquiere
2001-01-30 20:51 ` yodaiken
2001-01-30 21:00 ` David Woodhouse
2001-01-29 22:08 ` Pavel Machek
2001-01-29 22:31 ` Roger Larsson
2001-01-29 23:46 ` Joe deBlaquiere
2001-01-30 15:08 ` David Woodhouse
2001-01-12 13:21 ` Andrew Morton
2001-01-13 2:45 ` Jay Ts
2001-01-21 0:10 ` yodaiken
2001-01-26 9:14 ` Pavel Machek
2001-01-13 18:11 ` video drivers hog pci bus ? [was:[linux-audio-dev] low-latency scheduling patch for 2.4.0] Jörn Nettingsmeier
2001-01-14 11:35 ` low-latency scheduling patch for 2.4.0 Andrew Morton
2001-01-14 14:38 ` Gregory Maxwell
2001-01-15 10:59 ` Andrew Morton [this message]
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