Messages in this thread | | | Date | Thu, 03 Sep 1998 13:27:21 +0000 | From | Petko Manolov <> | Subject | Re: Differences between FreeBSD and Linux system call mechanism |
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> Terry Lambert wrote: > > Linux uses a call-gate based kernel entry, which is TSS based, and
It is not TSS baset, it is _trap_ based and uses int 0x80. Look at .../linux/arch/i386/kernel/traps.c and entry.S
> therefore takes more CPU cycles on a contect switch than strictly > required. The FreeBSD mechanism for kernel entry (and subsequet > context switch) is threfore more efficient than that used by Linux.
I don't know what is the BSD mechanism, but in Linux tasks are software switched since 2.1.1xx something. Read the note before __switch_to() in .../linux/arch/i386/kernel/process.c. I prefer _safe_ instead of _fast_ task switching.
Petkan
-- Petko Manolov, http://www.varel.bg/~petkan
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