Re: [PATCH] O6int for interactivity

From: Mike Galbraith <efault@gmx.de>
To: Wiktor Wodecki <wodecki@gmx.net>
Cc: Nick Piggin <piggin@cyberone.com.au>,
	Davide Libenzi <davidel@xmailserver.org>,
	Con Kolivas <kernel@kolivas.org>,
	linux kernel mailing list <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@osdl.org>,
	Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
	Zwane Mwaikambo <zwane@arm.linux.org.uk>
Subject: Re: [PATCH] O6int for interactivity
Date: Fri, 18 Jul 2003 17:46:01 +0200	[thread overview]
Message-ID: <5.2.1.1.2.20030718174433.01b12878@pop.gmx.net> (raw)
In-Reply-To: <20030718103105.GE622@gmx.de>

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At 12:31 PM 7/18/2003 +0200, Wiktor Wodecki wrote:
>On Fri, Jul 18, 2003 at 12:18:33PM +0200, Mike Galbraith wrote:
> > That _might_ (add salt) be priorities of kernel threads dropping too low.
> >
> > I'm also seeing occasional total stalls under heavy I/O in the order of
> > 10-12 seconds (even the disk stops).  I have no idea if that's 
> something in
> > mm or the scheduler changes though, as I've yet to do any isolation and/or
> > tinkering.  All I know at this point is that I haven't seen it in stock 
> yet.
>
>I've seen this too while doing a huge nfs transfer from a 2.6 machine to
>a 2.4 machine (sparc32). Thought it'd be something with the nfs changes
>which were recently, might be the scheduler, tho. Ah, and it is fully
>reproducable.

Telling to not mess with my kernel threads seems to have fixed it here... 
no stalls during the whole contest run.  New contest numbers attached.

         -Mike 

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no_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	153	94.8	0.0	0.0	1.00
2.5.70                1	153	94.1	0.0	0.0	1.00
2.6.0-test1           1	153	94.1	0.0	0.0	1.00
2.6.0-test1-mm1       1	152	94.7	0.0	0.0	1.00
2.6.0-test1-mm1X      1	153	94.8	0.0	0.0	1.00
cacherun:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	146	98.6	0.0	0.0	0.95
2.5.70                1	146	98.6	0.0	0.0	0.95
2.6.0-test1           1	146	98.6	0.0	0.0	0.95
2.6.0-test1-mm1       1	146	98.6	0.0	0.0	0.96
2.6.0-test1-mm1X      1	146	98.6	0.0	0.0	0.95
process_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	331	43.8	90.0	55.3	2.16
2.5.70                1	199	72.4	27.0	25.5	1.30
2.6.0-test1           1	264	54.5	61.0	44.3	1.73
2.6.0-test1-mm1       1	323	44.9	88.0	54.2	2.12
2.6.0-test1-mm1X      1	268	54.1	62.0	44.8	1.75
ctar_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	190	77.9	0.0	0.0	1.24
2.5.70                1	186	80.1	0.0	0.0	1.22
2.6.0-test1           1	213	70.4	0.0	0.0	1.39
2.6.0-test1-mm1       1	207	72.5	0.0	0.0	1.36
2.6.0-test1-mm1X      1	213	70.4	0.0	0.0	1.39
xtar_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	196	75.0	0.0	3.1	1.28
2.5.70                1	195	75.9	0.0	3.1	1.27
2.6.0-test1           1	193	76.7	1.0	4.1	1.26
2.6.0-test1-mm1       1	195	75.9	1.0	4.1	1.28
2.6.0-test1-mm1X      1	191	77.5	1.0	4.2	1.25
io_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	437	34.6	69.1	15.1	2.86
2.5.70                1	401	37.7	72.3	17.4	2.62
2.6.0-test1           1	243	61.3	48.1	17.3	1.59
2.6.0-test1-mm1       1	336	44.9	64.5	17.3	2.21
2.6.0-test1-mm1X      1	317	47.3	63.5	17.7	2.07
io_other:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	387	38.8	69.3	17.3	2.53
2.5.70                1	422	36.0	75.3	17.1	2.76
2.6.0-test1           1	258	57.8	55.8	19.0	1.69
2.6.0-test1-mm1       1	330	45.5	63.2	17.2	2.17
2.6.0-test1-mm1X      1	302	49.7	59.1	17.2	1.97
read_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	221	67.0	9.4	3.6	1.44
2.5.70                1	220	67.3	9.4	3.6	1.44
2.6.0-test1           1	200	74.0	9.7	4.0	1.31
2.6.0-test1-mm1       1	190	78.4	9.2	4.2	1.25
2.6.0-test1-mm1X      1	187	79.7	8.4	3.7	1.22
list_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	203	71.4	99.0	20.2	1.33
2.5.70                1	205	70.7	104.0	20.5	1.34
2.6.0-test1           1	199	72.4	102.0	21.6	1.30
2.6.0-test1-mm1       1	193	75.1	91.0	19.7	1.27
2.6.0-test1-mm1X      1	194	74.7	91.0	19.6	1.27
mem_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	256	57.8	34.0	1.2	1.67
2.5.70                1	252	58.7	33.0	1.2	1.65
2.6.0-test1           1	309	48.2	75.0	2.3	2.02
2.6.0-test1-mm1       1	277	53.8	38.0	1.4	1.82
2.6.0-test1-mm1X      1	225	65.8	38.0	1.8	1.47
dbench_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	517	28.8	5.0	35.6	3.38
2.5.70                1	424	35.1	3.0	26.7	2.77
2.6.0-test1           1	347	42.7	4.0	39.5	2.27
2.6.0-test1-mm1       1	377	39.8	4.0	36.9	2.48
2.6.0-test1-mm1X      1	510	29.4	5.0	34.3	3.33
ab_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.5.69                1	300	48.3	46.0	21.7	1.96
2.5.70                1	300	48.0	46.0	22.0	1.96
2.6.0-test1           1	281	51.6	50.0	25.6	1.84
2.6.0-test1-mm1       1	229	63.3	30.0	18.3	1.51
2.6.0-test1-mm1X      1	225	64.4	27.0	18.2	1.47
irman2_load:
Kernel           [runs]	Time	CPU%	Loads	LCPU%	Ratio
2.6.0-test1           1	999	14.5	31.0	0.0	6.53
2.6.0-test1-mm1       1	210	69.0	6.0	0.0	1.38
2.6.0-test1-mm1X      1	210	69.0	6.0	0.0	1.37