[haiku-bugs] Re: [Haiku] #5137: [PATCH] Compressed Kernel and Modules.
- From: "Grey" <trac@xxxxxxxxxxxx>
- Date: Thu, 17 Dec 2009 10:13:46 -0000
#5137: [PATCH] Compressed Kernel and Modules.
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Reporter: Grey | Owner: axeld
Type: enhancement | Status: new
Priority: normal | Milestone: R1
Component: System/Boot Loader | Version: R1/alpha1
Keywords: compressed kernel CELF | Blockedby:
Platform: All | Blocking:
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Comment(by Grey):
Replying to [comment:1 stippi]:[[BR]]
> ... I presume you have made some performance measurements?
Can you give some numbers as to what speed-up you have achieved?[[BR]]
Speed-up depend of perfomance CPU and disk.[[BR]]
My computer - Core2 Duo P8600 2.4GHz and hard disk[[BR]]
HITACHI HTS542525K9SA00 5400rpm.[[BR]]
Raw measurements of "load kernel+modules":[[BR]]
Compression level 0 - 401218 CPU ticks (Syste_time() use rdtsc)[[BR]]
Compression level 6 - 293753 CPU ticks (Syste_time() use rdtsc)[[BR]]
But ticks is not real time.[[BR]]
Simple time estimation:[[BR]]
Uncompressed kernel+modules size s=1.4M[[BR]]
Compressed kernel+modules size S=3.9M[[BR]]
Delta size = S-s = 1.5M[[BR]]
Hard disk read speed - V=50M/s; SSD V=200M/s; USB flush V=10M/s; CD
V=?[[BR]]
Delta time =(S-s)/V[[BR]]
> ...I spotted some coding style violations, particularily, we put spaces
around operators such as + and *...
Ok. Style improved patch attached.
BTW, how about using C/C++ stylers like indent, astyle or BCPP? Is there
standart parameters for Haiku style?
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Ticket URL: <http://dev.haiku-os.org/ticket/5137#comment:2>
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