From: "Ming Liu" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: RE: What is the difference between Montavista Kernel
SourceandKernel.Org Source
Date: Sun, 18 Feb 2007 13:54:13 +0000
In fact, I have a same question. I also want to know what's the most
obvious difference between Mvista and the common kernel. In detail, is
there any different mechanism for Montavista to make sure a better
performance, like Ethernet? In my project, it generates a different
ethernet performance for my general kernel from Montavista 4.01. I want to
make sure if Montavista have something special to guarantee a higher
performance.
Another question. Because Montavista kernel is also based on the open
source linux kernel from the general tree, does this mean that the
Montavista one is also open source and could be free to be distributed
according to GPL. However as far as I know, that's not true. :)
BR
Ming
I have worked with MontaVista Pro 3.1 (2.4.20 MontaVista Linux Kernel) and
the main (significant) differences that I saw between MontaVista and say the
ELDK 2.4.25 kernel were:
1. PREEMPTION PATCH was included in MontaVista 3.1
2. MontaVista's MMU, scheduling, and forking code was different than the
main stream. It had some patches added in.
3. There was quite a bit of difference between the asm-ppc trees (i.e many
places with board specific #define differences )
4. Between the 2.4.20 MontaVista and the 2.4.25 ELDK, obvious driver
improvements and kernel improvements had been added in, but I attribute that
mostly to the jump from 2.4.20 to 2.4.25.
I had problems with the MontaVista kernel where processes were randomly
crashing because of SIGSEGV or SIGFPEs. I couldn't find any info on the
internet and didn't have time to debug the kernel. I eventually switched to
the ELDK 2.4.25 kernel and all my random crashing problems disappeared...
and I don't really see huge performance differences (IN MY SPECIFIC
APPLICATION) without the kernel PREEMPTION.
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