Messages in this thread | | | Date | Wed, 23 Jun 1999 11:34:12 +1000 | From | Richard Gooch <> | Subject | Re: 2.3.7: where are the gains? |
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Ingo Molnar writes: > > On Tue, 22 Jun 1999, Richard Gooch wrote: > > > Hi, all. A quick test compiling the 2.3.7 kernel tree shows 2.3.7 > > perform slightly worse than 2.3.5 for make dep. PII 233 with IDE disc. > > compiling the kernel is very CPU-intensive, about 95% of the time is spent > in user-space. > > nevertheless the speedup does seem to show up: > > > 2.3.7: > > time make zImage > > 291.870u 17.570s 5:14.29 98.4% 0+0k 0+0io 192480pf+0w > ^^^^^^^ > > > 2.3.5: > > time make zImage > > 291.590u 18.810s 5:14.38 98.7% 0+0k 0+0io 194125pf+0w > ^^^^^^^ > an about 10% speedup for the kernel-only component. Considering that > compiling the kernel is doing mostly reads (well it writes object files > but the source is bigger, unless you compile with -g), and is accessing > files - this is not bad at all i think.
But, DaveM said in another thread: > One decent example of this case is a kernel build, generating all > the .depend etc. files and then reading them back almost > immediately.
2.3.7: time make dep 21.950u 3.120s 0:26.90 93.1% 0+0k 0+0io 41875pf+0w
2.3.5: time make dep 22.240u 2.800s 0:25.90 96.6% 0+0k 0+0io 42128pf+0w
So we see an increase of 11% in system time, when going from 2.3.5 to 2.3.7. But according to what DaveM said, this is a case which should definately have benefited.
Regards,
Richard....
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