3.0.0-rc6 ~9X system time degradation on kernbench
Just some numbers out of kernbench. System Time & Context Switches climb dramatically between 2.6.38 and 3.0.0-rc6. Currently bisecting to find out why. .config is based on Fedora's x86_64 .config.
Thu Jul 7 18:23:48 EDT 2011
2.6.38.8-32.fc15.x86_64
Average Half load -j 64 Run (std deviation):
Elapsed Time 155.376 (3.77835)
User Time 4536.18 (11.5886)
System Time 1810.42 (27.0879)
Percent CPU 4086 (100.252)
Context Switches 794941 (3757.3)
Sleeps 754029 (10516)
Thu Jul 7 19:50:38 EDT 2011
3.0.0-rc6
Average Half load -j 64 Run (std deviation):
Elapsed Time 466.362 (2.78605)
User Time 8616.43 (22.5528)
System Time 14583.6 (63.2273)
Percent CPU 4974.2 (19.6265)
Context Switches 2.69157e+06 (7679.26)
Sleeps 827950 (3050.16)
Thu Jul 7 21:30:22 EDT 2011
2.6.39
Average Half load -j 64 Run (std deviation):
Elapsed Time 250.044 (2.55373)
User Time 5361.27 (14.6996)
System Time 5173.44 (14.9366)
Percent CPU 4212.8 (40.4314)
Context Switches 1.28385e+06 (1610.42)
Sleeps 741129 (3339.19)
Fri Jul 8 12:21:29 EDT 2011
3.0.0-rc1
Average Optimal load -j 64 Run (std deviation):
Elapsed Time 435.338 (5.45314)
User Time 6125.78 (15.2816)
System Time 8346.45 (62.5065)
Percent CPU 3324.2 (29.0637)
Context Switches 6.42863e+06 (23420)
Sleeps 996764 (3744.98)
P.
Quoted 3 lines · Prarit Bhargava
Just some numbers out of kernbench. System Time& Context Switches climb dramatically between 2.6.38 and 3.0.0-rc6. Currently bisecting to find out why. .config is based on Fedora's
x86_64.config.
For the record, I am also seeing dramatically increased CPU use with the 3.0-rc kernel, vs 2.6.38.
I first attributed it to me upgrading my video card, but Prarit is seeing slowdowns too, so it's not just me...
Signature · 1 line
All rights reversed
Quoted 5 lines · Rik van Riel
Quoted 3 lines · Prarit Bhargava
Just some numbers out of kernbench. System Time& Context Switches climb dramatically between 2.6.38 and 3.0.0-rc6. Currently bisecting to find out why. .config is based on Fedora's
x86_64.config.
Er, if you're using Fedora's config, did you 'make release' first? grep DEBUG in the config and see why... ;-)
Quoted 14 lines
For the record, I am also seeing dramatically increased CPU use with the 3.0-rc kernel, vs 2.6.38.
I first attributed it to me upgrading my video card, but Prarit is seeing slowdowns too, so it's not just me...
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Quoted 4 lines · Kyle McMartin
Quoted 2 lines · Rik van Riel
On 07/08/2011 03:36 PM, Prarit Bhargava wrote:
Quoted 8 lines
Quoted 5 lines
Quoted 4 lines
Just some numbers out of kernbench. System Time& Context Switches climb dramatically between 2.6.38 and 3.0.0-rc6. Currently bisecting to find out why. .config is based on Fedora's
x86_64.config.Er, if you're using Fedora's config, did you 'make release' first? grep DEBUG in the config and see why... ;-)
That did it :)
Thu Jul 14 15:33:27 EDT 2011
3.0.0-rc7+
Average Optimal load -j 48 Run (std deviation):
Elapsed Time 178.384 (0.618692)
User Time 3970.09 (1.93208)
System Time 587.498 (0.511488)
Percent CPU 2554.2 (8.58487)
Context Switches 1.08771e+06 (9697.64) Sleeps 871265 (13137.6)
Thu Jul 14 16:06:39 EDT 2011 2.6.38.8-35.fc15.x86_64
Average Optimal load -j 48 Run (std deviation):
Elapsed Time 184.6 (8.64522)
User Time 3961.07 (5.05)
System Time 637.382 (11.7187)
Percent CPU 2494.4 (102.827)
Context Switches 1.09046e+06 (3986.03) Sleeps 873607 (4756.41)
Still a bit higher ... but not 9x ... thanks Kyle.
P.